preliminary implementation of IWS - Invoke Web Service Method

mocha-dotnet/src/lib/Mocha.Core/KnownInstanceGuids.cs

@@ -304,7 +304,11 @@ namespace Mocha.Core
 																												  // BWSR - Build Web Service Response Method - 171
 																												  // GRE - Get Referenced Element Method - 197
 			public static Guid GetRelationshipMethod { get; } = new Guid("{d53c9232-89ef-4cca-8520-261da6787450}"); // 207
-																													// IWS - Invoke Web Service Method - 208
+			/// <summary>
+			/// IWS - Invoke Web Service Method [1$208]
+			/// </summary>
+			/// <returns></returns>
+			public static Guid InvokeWebServiceMethod { get; } = new Guid("{26d9e733-50a0-49f7-9b2c-2142934e3952}");
 			public static Guid InstanceOpMethod { get; } = new Guid("{4c814982-938f-4116-bdc1-827bae6a5f71}");
 			public static Guid ConditionalSelectAttributeMethod { get; } = new Guid("{d534a369-321e-4c32-bd7f-8ff2017f191e}"); // 13038
 																															   // SSC - Conditional Select from Instance Set Method - 13039
@@ -547,5 +551,11 @@ namespace Mocha.Core
 			public static Guid Complement { get; } = new Guid("{fa69b904-315b-4bb1-80a6-c71708fbfde5}");
 			public static Guid Difference { get; } = new Guid("{ec67f62d-387c-4179-9b03-0d9b70195688}");
 		}
+		public static class WebServiceInvocationTypes
+		{
+			public static Guid BasicAuth { get; } = new Guid("{88372a06-7025-4e08-880e-7bc472e77003}");
+			public static Guid OAuth2 { get; } = new Guid("{9e62468f-0c8e-49ad-a61b-839bdb3509ac}");
+			public static Guid Microsoft { get; } = new Guid("{bd9cc03f-a0c1-4815-95b9-d7d3d21599a8}");
+		}
 	}
 }

mocha-dotnet/src/lib/Mocha.Core/KnownRelationshipGuids.cs

@@ -472,5 +472,14 @@ namespace Mocha.Core
 		public static Guid Filter_By_Type_Op__uses__Class { get; } = new Guid("{2f5fddc8-5ab0-4c59-8a83-536a2ce0a30c}");
 
 		public static Guid Combine_Sets_Op__uses__Set_Function { get; } = new Guid("{b20e54d4-2535-44c0-8c99-0411f27a69df}");
+
+		
+		public static Guid Invoke_Web_Service_Method__has_user_id__Executable_returning_Attribute { get; } = new Guid("{dc567ccc-ec9f-4e8b-b698-fb52bb21502a}");
+		public static Guid Invoke_Web_Service_Method__has_password__Executable_returning_Attribute { get; } = new Guid("{b7d8ac3b-9419-4a49-8ebf-22aa08d9ff16}");
+		public static Guid Invoke_Web_Service_Method__has_destination_url__Executable_returning_Attribute { get; } = new Guid("{bbd9b5a7-041f-4fb3-a8c1-2889ff2e17a7}");
+		public static Guid Invoke_Web_Service_Method__has__Web_Service_Invocation_Type { get; } = new Guid("{429218f8-0ea7-4177-83be-74efe59b65b1}");
+		public static Guid Invoke_Web_Service_Method__uses__Executable_returning_Element { get; } = new Guid("{020e26ba-565d-47a4-bdcc-f0050ff6b848}");
+		public static Guid Invoke_Web_Service_Method__correlated_instances_from__Executable_returning_Instance_Set { get; } = new Guid("{8f1406b4-f48f-45fb-a6ef-2ad51998735f}");
+		public static Guid Invoke_Web_Service_Method__has_error__Executable_returning_Element { get; } = new Guid("{86aa5338-d913-4044-af8d-7aa4e1a9ddbc}");
     }
 }

mocha-dotnet/src/lib/Mocha.Core/MethodImplementations/InvokeWebServiceMethodImplementation.cs

@@ -0,0 +1,63 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of Mocha.NET.
+// 
+// Mocha.NET is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// Mocha.NET is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with Mocha.NET.  If not, see <https://www.gnu.org/licenses/>.
+
+using System.Text.Json.Nodes;
+
+namespace Mocha.Core.MethodImplementations;
+
+public class InvokeWebServiceMethodImplementation : MethodImplementation
+{
+    public override Guid MethodClassGuid => KnownInstanceGuids.MethodClasses.InvokeWebServiceMethod;
+	
+
+    protected override InstanceHandle ExecuteInternal(Oms oms, OmsContext context, InstanceHandle method)
+    {
+		InstanceHandle r_Method__for__Class = oms.GetInstance(KnownRelationshipGuids.Method__for__Class);
+
+		InstanceHandle userIdAttribute = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_user_id__Executable_returning_Attribute));
+		string userId = oms.Evaluate<string>(context, userIdAttribute);
+		
+		InstanceHandle passwordAttribute = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_password__Executable_returning_Attribute));
+		string password = oms.Evaluate<string>(context, passwordAttribute);
+		
+		InstanceHandle destinationUrlAttribute = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_destination_url__Executable_returning_Attribute));
+		string destinationUrl = oms.Evaluate<string>(context, destinationUrlAttribute);
+
+		InstanceHandle errorElement = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_error__Executable_returning_Element));
+
+		using (HttpClient client = new HttpClient())
+		{
+			HttpRequestMessage req = new HttpRequestMessage(HttpMethod.Get, new Uri(destinationUrl));
+			try
+			{
+				HttpResponseMessage resp = client.Send(req);
+			}
+			catch (HttpRequestException ex)
+			{
+				if (errorElement != InstanceHandle.Empty)
+				{
+					JsonObject errorJson = oms.Evaluate<JsonObject>(context, errorElement, new KeyValuePair<InstanceHandle, object?>[]
+					{
+						new KeyValuePair<InstanceHandle, object?>(oms.GetInstance(KnownAttributeGuids.Text.Value), 404)
+					}, null, out InstanceHandle ws);
+					return errorElement;
+				}
+			}
+		}
+		return InstanceHandle.Empty;
+    }
+}

mocha-dotnet/src/lib/Mocha.Core/Oms.cs

@@ -2599,9 +2599,44 @@ public abstract class Oms
 		throw new FormatException();
     }
 
+	public T Evaluate<T>(OmsContext context, object? workDataObject, IEnumerable<KeyValuePair<InstanceHandle, object?>>? parms = null, T defaultValue = default(T))
+	{
+		InstanceHandle ws = InstanceHandle.Empty;
+		return Evaluate<T>(context, workDataObject, parms, defaultValue, out ws);
+	}
+	public T Evaluate<T>(OmsContext context, object? workDataObject, IEnumerable<KeyValuePair<InstanceHandle, object?>>? parms, T defaultValue, out InstanceHandle returnedWorkData)
+	{
+		object? value = Evaluate(context, workDataObject, InstanceHandle.Empty, parms, defaultValue, out returnedWorkData);
+		if (value is T)
+		{
+			return (T)value;
+		}
+		return defaultValue;
+	}
+
 	public object? Evaluate(OmsContext context, object? workDataObject, InstanceHandle sourceInstance, object? defaultValue = null)
 	{
+		return Evaluate(context, workDataObject, sourceInstance, null, defaultValue);
+	}
+
+	public object? Evaluate(OmsContext context, object? workDataObject, InstanceHandle sourceInstance, IEnumerable<KeyValuePair<InstanceHandle, object?>>? parms, object? defaultValue = null)
+	{
+		InstanceHandle ws = InstanceHandle.Empty;
+		return Evaluate(context, workDataObject, sourceInstance, parms, defaultValue, out ws);
+	}
+
+	public object? Evaluate(OmsContext context, object? workDataObject, InstanceHandle sourceInstance, IEnumerable<KeyValuePair<InstanceHandle, object?>>? parms, object? defaultValue, out InstanceHandle returnedWorkData)
+	{
+		returnedWorkData = InstanceHandle.Empty;
 		object? value = defaultValue;
+		if (parms != null)
+		{
+			foreach (KeyValuePair<InstanceHandle, object?> kvp in parms)
+			{
+				context.SetWorkData(kvp.Key, kvp.Value);
+			}
+		}
+
 		if (workDataObject is InstanceHandle workDataInstance)
 		{
 			if (IsInstanceOf(workDataInstance, GetInstance(KnownInstanceGuids.Classes.TextAttribute)))
@@ -2614,6 +2649,7 @@ public abstract class Oms
 				else
 				{
 					value = context.GetWorkData<string>(workDataInstance);
+					returnedWorkData = workDataInstance;
 				}
 			}
 			else if (IsInstanceOf(workDataInstance, GetInstance(KnownInstanceGuids.Classes.BooleanAttribute)))
@@ -2626,6 +2662,7 @@ public abstract class Oms
 				else
 				{
 					value = context.GetWorkData<bool>(workDataInstance);
+					returnedWorkData = workDataInstance;
 				}
 			}
 			else if (IsInstanceOf(workDataInstance, GetInstance(KnownInstanceGuids.Classes.NumericAttribute)))
@@ -2638,6 +2675,7 @@ public abstract class Oms
 				else
 				{
 					value = context.GetWorkData<decimal>(workDataInstance);
+					returnedWorkData = workDataInstance;
 				}
 			}
 			else if (IsInstanceOf(workDataInstance, GetInstance(KnownInstanceGuids.Classes.DateAttribute)))
@@ -2650,6 +2688,7 @@ public abstract class Oms
 				else
 				{
 					value = context.GetWorkData<DateTime>(workDataInstance);
+					returnedWorkData = workDataInstance;
 				}
 			}
 			else if (IsInstanceOf(workDataInstance, GetInstance(KnownInstanceGuids.Classes.WorkSet)))
@@ -2662,12 +2701,14 @@ public abstract class Oms
 				else
 				{
 					value = context.GetWorkData(workDataInstance);
+					returnedWorkData = workDataInstance;
 				}
 			}
 			else if (IsInstanceOf(workDataInstance, GetInstance(KnownInstanceGuids.Classes.Executable)))
 			{
 				InstanceHandle workSet = Execute(context, workDataInstance);
 				value = context.GetWorkData(workSet);
+				returnedWorkData = workSet;
 			}
 			else
 			{
@@ -2676,6 +2717,7 @@ public abstract class Oms
 				InstanceHandle workData = Execute(context, workDataInstance);
 				object? val = context.GetWorkData(workData);
 				value = val?.ToString();
+				returnedWorkData = workData;
 			}
 		}
 		else

mocha-dotnet/src/lib/Mocha.Core/OmsMethodBuilder.cs

@@ -67,11 +67,11 @@ public class OmsMethodBuilder
 		return new BuildResponseMethodBinding(methodBinding);
 	}
 
-	public GetAttributeMethod CreateGetAttributeMethod(InstanceHandle forClassInstance, string verb, string name, InstanceHandle attributeInstance)
+	public GetAttributeMethod CreateGetAttributeMethod(IInstanceReference forClassInstance, string verb, string name, InstanceHandle attributeInstance)
 	{
 		return CreateGetAttributeMethod(forClassInstance, verb, name, null, false, attributeInstance);
 	}
-	public GetAttributeMethod CreateGetAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle attributeInstance)
+	public GetAttributeMethod CreateGetAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle attributeInstance)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.GetAttributeMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Get_Attribute_Method__returns__Attribute), attributeInstance);
@@ -79,21 +79,21 @@ public class OmsMethodBuilder
 	}
 
 
-	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(InstanceHandle forClassInstance, string verb, string name, WorkSet returnsWorkSet, InstanceHandle specifiedInstance)
+	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(IInstanceReference forClassInstance, string verb, string name, WorkSet returnsWorkSet, InstanceHandle specifiedInstance)
 	{
 		return CreateGetSpecifiedInstancesMethod(forClassInstance, verb, name, null, false, returnsWorkSet, specifiedInstance);
 	}
-	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceHandle specifiedInstance)
+	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceHandle specifiedInstance)
 	{
 		GetSpecifiedInstancesMethod meth = CreateGetSpecifiedInstancesMethod(forClassInstance, verb, name, accessModifier, isStatic, returnsWorkSet, new InstanceHandle[] { specifiedInstance });
 		Oms.SetAttributeValue(meth.GetHandle(), Oms.GetInstance(KnownAttributeGuids.Boolean.Singular), true);
 		return meth;
 	}
-	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(InstanceHandle forClassInstance, string verb, string name, WorkSet returnsWorkSet, InstanceHandle[] specifiedInstances)
+	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(IInstanceReference forClassInstance, string verb, string name, WorkSet returnsWorkSet, InstanceHandle[] specifiedInstances)
 	{
 		return CreateGetSpecifiedInstancesMethod(forClassInstance, verb, name, null, false, returnsWorkSet, specifiedInstances);
 	}
-	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceHandle[] specifiedInstances)
+	public GetSpecifiedInstancesMethod CreateGetSpecifiedInstancesMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceHandle[] specifiedInstances)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.GetSpecifiedInstancesMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Get_Specified_Instances_Method__returns__Work_Set), returnsWorkSet.GetHandle());
@@ -101,11 +101,11 @@ public class OmsMethodBuilder
 		return new GetSpecifiedInstancesMethod(method);
 	}
 
-	private InstanceHandle CreateMethodBase(InstanceHandle methodClassInstance, InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic)
+	private InstanceHandle CreateMethodBase(IInstanceReference methodClassInstance, IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic)
 	{
 		return CreateMethodBase(methodClassInstance, forClassInstance, verb, name, accessModifier, isStatic, Guid.NewGuid());
 	}
-	private InstanceHandle CreateMethodBase(InstanceHandle methodClassInstance, InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier)
+	private InstanceHandle CreateMethodBase(IInstanceReference methodClassInstance, IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier)
 	{
 		InstanceHandle method = Oms.CreateInstanceOf(methodClassInstance, globalIdentifier);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Method__for__Class), forClassInstance);
@@ -124,7 +124,7 @@ public class OmsMethodBuilder
 		return method;
 	}
 
-	public BuildAttributeMethod CreateBuildAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, string initialValue = "")
+	public BuildAttributeMethod CreateBuildAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, string initialValue = "")
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.BuildAttributeMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Build_Attribute_Method__returns__Attribute), returnsAttribute);
@@ -132,7 +132,7 @@ public class OmsMethodBuilder
 		return new BuildAttributeMethod(method);
 	}
 
-	public BuildAttributeMethod CreateBuildAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, object? initialValue = null)
+	public BuildAttributeMethod CreateBuildAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, object? initialValue = null)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.BuildAttributeMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Build_Attribute_Method__returns__Attribute), returnsAttribute);
@@ -151,11 +151,11 @@ public class OmsMethodBuilder
 		return new BuildAttributeMethod(method);
 	}
 
-	public GetAttributeBySystemRoutineMethod CreateGetAttributeBySystemRoutineMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, SystemAttributeRoutine usesSystemAttributeRoutine)
+	public GetAttributeBySystemRoutineMethod CreateGetAttributeBySystemRoutineMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, SystemAttributeRoutine usesSystemAttributeRoutine)
 	{
 		return CreateGetAttributeBySystemRoutineMethod(forClassInstance, verb, name, accessModifier, isStatic, Guid.NewGuid(), returnsAttribute, usesSystemAttributeRoutine);
 	}
-	public GetAttributeBySystemRoutineMethod CreateGetAttributeBySystemRoutineMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier, InstanceHandle returnsAttribute, SystemAttributeRoutine usesSystemAttributeRoutine)
+	public GetAttributeBySystemRoutineMethod CreateGetAttributeBySystemRoutineMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier, InstanceHandle returnsAttribute, SystemAttributeRoutine usesSystemAttributeRoutine)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.GetAttributeBySystemRoutineMethod), forClassInstance, verb, name, accessModifier, isStatic, globalIdentifier);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Get_Attribute_by_System_Routine_Method__returns__Attribute), returnsAttribute);
@@ -163,11 +163,11 @@ public class OmsMethodBuilder
 		return new GetAttributeBySystemRoutineMethod(method);
 	}
 
-	public GetInstanceSetBySystemRoutineMethod CreateGetInstanceSetBySystemRoutineMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, SystemInstanceSetRoutine usesSystemInstanceSetRoutine)
+	public GetInstanceSetBySystemRoutineMethod CreateGetInstanceSetBySystemRoutineMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, SystemInstanceSetRoutine usesSystemInstanceSetRoutine)
 	{
 		return CreateGetInstanceSetBySystemRoutineMethod(forClassInstance, verb, name, accessModifier, isStatic, Guid.NewGuid(), returnsWorkSet, usesSystemInstanceSetRoutine);
 	}
-	public GetInstanceSetBySystemRoutineMethod CreateGetInstanceSetBySystemRoutineMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier, WorkSet returnsWorkSet, SystemInstanceSetRoutine usesSystemInstanceSetRoutine)
+	public GetInstanceSetBySystemRoutineMethod CreateGetInstanceSetBySystemRoutineMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier, WorkSet returnsWorkSet, SystemInstanceSetRoutine usesSystemInstanceSetRoutine)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.GetAttributeBySystemRoutineMethod), forClassInstance, verb, name, accessModifier, isStatic, globalIdentifier);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Get_Instance_Set_by_System_Routine_Method__returns__Work_Set), returnsWorkSet.GetHandle());
@@ -175,11 +175,11 @@ public class OmsMethodBuilder
 		return new GetInstanceSetBySystemRoutineMethod(method);
 	}
 	
-	public AssignAttributeMethod CreateAssignAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, ReturnAttributeMethodBinding assignsFromExecutableReturningAttribute, InstanceHandle assignsToAttribute)
+	public AssignAttributeMethod CreateAssignAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, ReturnAttributeMethodBinding assignsFromExecutableReturningAttribute, InstanceHandle assignsToAttribute)
 	{
 		return CreateAssignAttributeMethod(forClassInstance, verb, name, accessModifier, isStatic, assignsFromExecutableReturningAttribute.GetHandle(), assignsToAttribute);
 	}
-	public AssignAttributeMethod CreateAssignAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle assignsFromExecutableReturningAttribute, InstanceHandle assignsToAttribute)
+	public AssignAttributeMethod CreateAssignAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle assignsFromExecutableReturningAttribute, InstanceHandle assignsToAttribute)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.AssignAttributeMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Assign_Attribute_Method__uses__Executable_returning_Attribute), assignsFromExecutableReturningAttribute);
@@ -187,19 +187,19 @@ public class OmsMethodBuilder
 		return new AssignAttributeMethod(method);
 	}
 
-	public GetRelationshipMethod CreateGetRelationshipMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, Relationship returnsRelationship, bool singular = false)
+	public GetRelationshipMethod CreateGetRelationshipMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, Relationship returnsRelationship, bool singular = false)
 	{
 		return CreateGetRelationshipMethod(forClassInstance, verb, name, accessModifier, Guid.NewGuid(), returnsRelationship.GetHandle(), singular);
 	}
-	public GetRelationshipMethod CreateGetRelationshipMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, Guid globalIdentifier, Relationship returnsRelationship, bool singular = false)
+	public GetRelationshipMethod CreateGetRelationshipMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, Guid globalIdentifier, Relationship returnsRelationship, bool singular = false)
 	{
 		return CreateGetRelationshipMethod(forClassInstance, verb, name, accessModifier, globalIdentifier, returnsRelationship.GetHandle(), singular);
 	}
-	public GetRelationshipMethod CreateGetRelationshipMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, InstanceHandle returnsRelationship, bool singular = false)
+	public GetRelationshipMethod CreateGetRelationshipMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, InstanceHandle returnsRelationship, bool singular = false)
 	{
 		return CreateGetRelationshipMethod(forClassInstance, verb, name, accessModifier, Guid.NewGuid(), returnsRelationship, singular);
 	}
-	public GetRelationshipMethod CreateGetRelationshipMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, Guid globalIdentifier, InstanceHandle returnsRelationship, bool singular = false)
+	public GetRelationshipMethod CreateGetRelationshipMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, Guid globalIdentifier, InstanceHandle returnsRelationship, bool singular = false)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.GetRelationshipMethod), forClassInstance, verb, name, accessModifier, false, globalIdentifier);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Get_Relationship_Method__returns__Relationship), returnsRelationship);
@@ -207,11 +207,11 @@ public class OmsMethodBuilder
 		return new GetRelationshipMethod(method);
 	}
 
-	public GetReferencedAttributeMethod CreateGetReferencedAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, IExecutableReturningInstanceSet usesReferenceInstanceSet, IExecutableReturningAttribute usesAnswerExecutableReturningAttribute, InstanceHandle? usesAccumulationFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
+	public GetReferencedAttributeMethod CreateGetReferencedAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, IExecutableReturningInstanceSet usesReferenceInstanceSet, IExecutableReturningAttribute usesAnswerExecutableReturningAttribute, InstanceHandle? usesAccumulationFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
 	{
 		return CreateGetReferencedAttributeMethod(forClassInstance, verb, name, accessModifier, isStatic, returnsAttribute, usesReferenceInstanceSet.GetHandle(), usesAnswerExecutableReturningAttribute.GetHandle(), usesAccumulationFunction, usesOrderExecutableReturningAttribute);
 	}
-	public GetReferencedAttributeMethod CreateGetReferencedAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, InstanceHandle usesReferenceInstanceSet, InstanceHandle usesAnswerExecutableReturningAttribute, InstanceHandle? usesAccumulationFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
+	public GetReferencedAttributeMethod CreateGetReferencedAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, InstanceHandle usesReferenceInstanceSet, InstanceHandle usesAnswerExecutableReturningAttribute, InstanceHandle? usesAccumulationFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.GetReferencedAttributeMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Get_Referenced_Attribute_Method__returns__Attribute), returnsAttribute);
@@ -228,26 +228,22 @@ public class OmsMethodBuilder
 		return new GetReferencedAttributeMethod(method);
 	}
 	
-	public SelectFromInstanceSetMethod CreateSelectFromInstanceSetMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceWrapper usesExecutableReturningInstanceSet, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
+	public SelectFromInstanceSetMethod CreateSelectFromInstanceSetMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, IInstanceReference returnsWorkSet, IInstanceReference? usesExecutableReturningInstanceSet, IInstanceReference? usesSetFunction = null, IInstanceReference? usesSelectionFunction = null, IInstanceReference? usesOrderExecutableReturningAttribute = null)
-	{
-		return CreateSelectFromInstanceSetMethod(forClassInstance, verb, name, accessModifier, isStatic, returnsWorkSet.GetHandle(), usesExecutableReturningInstanceSet.GetHandle(), usesSetFunction, usesSelectionFunction, usesOrderExecutableReturningAttribute);
-	}
-	public SelectFromInstanceSetMethod CreateSelectFromInstanceSetMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsWorkSet, InstanceHandle usesExecutableReturningInstanceSet, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.SelectFromInstanceSetMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_From_Instance_Set_Method__returns__Work_Set), returnsWorkSet);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_from_Instance_Set_Method__uses__Executable_returning_Instance_Set), usesExecutableReturningInstanceSet);
 		if (usesSetFunction != null)
 		{
-			Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_from_Instance_Set_Method__uses__Set_Function), usesSetFunction.GetValueOrDefault());
+			Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_from_Instance_Set_Method__uses__Set_Function), usesSetFunction);
 		}
 		if (usesSelectionFunction != null)
 		{
-			Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_from_Instance_Set_Method__uses__Selection_Function), usesSelectionFunction.GetValueOrDefault());
+			Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_from_Instance_Set_Method__uses__Selection_Function), usesSelectionFunction);
 		}
 		if (usesOrderExecutableReturningAttribute != null)
 		{
-			Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_from_Instance_Set_Method__uses_order__Executable_returning_Attribute), usesOrderExecutableReturningAttribute.GetValueOrDefault());
+			Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Select_from_Instance_Set_Method__uses_order__Executable_returning_Attribute), usesOrderExecutableReturningAttribute);
 		}
 		/*
 		if (usesAccumulationFunction != null)
@@ -263,7 +259,7 @@ public class OmsMethodBuilder
 	}
 
 
-	public ConditionalSelectFromInstanceSetMethod CreateConditionalSelectFromInstanceSetMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceWrapper[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
+	public ConditionalSelectFromInstanceSetMethod CreateConditionalSelectFromInstanceSetMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceWrapper[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
 	{
 		List<InstanceHandle> cases2 = new List<InstanceHandle>();
 		foreach (InstanceWrapper wrapper in cases)
@@ -272,7 +268,7 @@ public class OmsMethodBuilder
 		}
 		return CreateConditionalSelectFromInstanceSetMethod(forClassInstance, verb, name, accessModifier, isStatic, returnsWorkSet.GetHandle(), cases2.ToArray(), usesSetFunction, usesSelectionFunction, usesOrderExecutableReturningAttribute);
 	}
-	public ConditionalSelectFromInstanceSetMethod CreateConditionalSelectFromInstanceSetMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsWorkSet, InstanceHandle[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
+	public ConditionalSelectFromInstanceSetMethod CreateConditionalSelectFromInstanceSetMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsWorkSet, InstanceHandle[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.ConditionalSelectFromInstanceSetMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Conditional_Select_From_Instance_Set_Method__returns__Work_Set), returnsWorkSet);
@@ -302,11 +298,11 @@ public class OmsMethodBuilder
 		return new ConditionalSelectFromInstanceSetMethod(method);
 	}
 
-	public ConditionalSelectAttributeMethod CreateConditionalSelectAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, ConditionalSelectAttributeCase[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
+	public ConditionalSelectAttributeMethod CreateConditionalSelectAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, ConditionalSelectAttributeCase[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
 	{
 		return CreateConditionalSelectAttributeMethod(forClassInstance, verb, name, accessModifier, isStatic, Guid.NewGuid(), returnsAttribute, cases, usesSetFunction, usesSelectionFunction, usesOrderExecutableReturningAttribute);
 	}
-	public ConditionalSelectAttributeMethod CreateConditionalSelectAttributeMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier, InstanceHandle returnsAttribute, ConditionalSelectAttributeCase[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
+	public ConditionalSelectAttributeMethod CreateConditionalSelectAttributeMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, Guid globalIdentifier, InstanceHandle returnsAttribute, ConditionalSelectAttributeCase[] cases, InstanceHandle? usesSetFunction = null, InstanceHandle? usesSelectionFunction = null, InstanceHandle? usesOrderExecutableReturningAttribute = null)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.ConditionalSelectAttributeMethod), forClassInstance, verb, name, accessModifier, isStatic, globalIdentifier);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Conditional_Select_Attribute_Method__returns__Attribute), returnsAttribute);
@@ -342,12 +338,12 @@ public class OmsMethodBuilder
 		return ih;
 	}
 
-	public EvaluateBooleanExpressionMethod CreateEvaluateBooleanExpressionMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, IInstanceReference sourceWorkData, BooleanOperator booleanOperator, IInstanceReference compareToWorkData = null)
+	public EvaluateBooleanExpressionMethod CreateEvaluateBooleanExpressionMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, IInstanceReference sourceWorkData, BooleanOperator booleanOperator, IInstanceReference compareToWorkData = null)
 	{
 		return CreateEvaluateBooleanExpressionMethod(forClassInstance, verb, name, accessModifier, isStatic, returnsAttribute, sourceWorkData.GetHandle(), booleanOperator, compareToWorkData?.GetHandle());
 	}
 
-	public EvaluateBooleanExpressionMethod CreateEvaluateBooleanExpressionMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, InstanceHandle sourceWorkData, BooleanOperator booleanOperator, InstanceHandle? compareToWorkData)
+	public EvaluateBooleanExpressionMethod CreateEvaluateBooleanExpressionMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, InstanceHandle sourceWorkData, BooleanOperator booleanOperator, InstanceHandle? compareToWorkData)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.EvaluateBooleanExpressionMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Evaluate_Boolean_Expression_Method__returns__Boolean_Attribute), returnsAttribute);
@@ -360,14 +356,14 @@ public class OmsMethodBuilder
 		return new EvaluateBooleanExpressionMethod(method);
 	}
 
-	public CalculateDateMethod CreateCalculateDateMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, InstanceHandle initialDateAttribute, InstanceHandle timeZoneRsmb, CalculateDateMethodIncrement preIncrement, InstanceHandle? startInterval, InstanceHandle? endInterval, CalculateDateMethodIncrement postIncrement)
+	public CalculateDateMethod CreateCalculateDateMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle returnsAttribute, InstanceHandle initialDateAttribute, InstanceHandle timeZoneRsmb, CalculateDateMethodIncrement preIncrement, InstanceHandle? startInterval, InstanceHandle? endInterval, CalculateDateMethodIncrement postIncrement)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.CalculateDateMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		
 		return new CalculateDateMethod(method);
 	}
 
-	public BuildElementMethod CreateBuildElementMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle hasBemProcess, InstanceHandle returnsElement)
+	public BuildElementMethod CreateBuildElementMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle hasBemProcess, InstanceHandle returnsElement)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.BuildElementMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Build_Element_Method__has__BEM_Process), hasBemProcess);
@@ -375,11 +371,11 @@ public class OmsMethodBuilder
 		return new BuildElementMethod(method);
 	}
 
-	public BuildUIResponseMethod CreateBuildUIResponseMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, IExecutableReturningElement usesExecutableReturningElement)
+	public BuildUIResponseMethod CreateBuildUIResponseMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, IExecutableReturningElement usesExecutableReturningElement)
 	{
 		return CreateBuildUIResponseMethod(forClassInstance, verb, name, accessModifier, isStatic, usesExecutableReturningElement.GetHandle());
 	}
-	public BuildUIResponseMethod CreateBuildUIResponseMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle usesExecutableReturningElement)
+	public BuildUIResponseMethod CreateBuildUIResponseMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle usesExecutableReturningElement)
 	{
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.BuildUIResponseMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		InstanceHandle r_Build_UI_Response_Method__uses__Executable_returning_Element = Oms.GetInstance(KnownRelationshipGuids.Build_UI_Response_Method__uses__Executable_returning_Element);
@@ -394,7 +390,7 @@ public class OmsMethodBuilder
 		return new BuildUIResponseMethod(method);
 	}
 
-    public ControlTransactionMethod CreateControlTransactionMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle processesElement, BuildResponseMethodBinding usesBuildResponseMethodBinding)
+    public ControlTransactionMethod CreateControlTransactionMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, InstanceHandle processesElement, BuildResponseMethodBinding usesBuildResponseMethodBinding)
     {
 		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.BuildUIResponseMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		InstanceHandle r_Control_Transaction_Method__processes__Element = Oms.GetInstance(KnownRelationshipGuids.Control_Transaction_Method__processes__Element);
@@ -433,11 +429,33 @@ public class OmsMethodBuilder
 		return new CalculateNumericMethod(method);
 	}
 
-	public InstanceOpMethod CreateInstanceOpMethod(InstanceHandle forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceOp invokesInstanceOp)
+	public InstanceOpMethod CreateInstanceOpMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, WorkSet returnsWorkSet, InstanceOp invokesInstanceOp)
 	{
 		InstanceHandle ih = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.InstanceOpMethod), forClassInstance, verb, name, accessModifier, isStatic);
 		Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Instance_Op_Method__returns__Work_Set), returnsWorkSet);
 		Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Op_Scope__invokes__Instance_Op), invokesInstanceOp);
 		return new InstanceOpMethod(ih);
     }
+
+	public InvokeWebServiceMethod CreateInvokeWebServiceMethod(IInstanceReference forClassInstance, string verb, string name, AccessModifier accessModifier, bool isStatic, IInstanceReference userIdAttribute, IInstanceReference passwordAttribute, IInstanceReference destinationUrlAttribute, IInstanceReference webServiceInvocationType, IInstanceReference? usesElement = null, IInstanceReference? correlatedInstanceSet = null, IInstanceReference? errorElement = null)
+	{
+		InstanceHandle ih = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.InvokeWebServiceMethod), forClassInstance, verb, name, accessModifier, isStatic);
+		Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_user_id__Executable_returning_Attribute), userIdAttribute);
+		Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_password__Executable_returning_Attribute), passwordAttribute);
+		Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_destination_url__Executable_returning_Attribute), destinationUrlAttribute);
+		Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has__Web_Service_Invocation_Type), webServiceInvocationType);
+		if (usesElement != null)
+		{
+			Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__uses__Executable_returning_Element), usesElement);
+		}
+		if (correlatedInstanceSet != null)
+		{
+			Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__correlated_instances_from__Executable_returning_Instance_Set), correlatedInstanceSet);
+		}
+		if (errorElement != null)
+		{
+			Oms.AssignRelationship(ih, Oms.GetInstance(KnownRelationshipGuids.Invoke_Web_Service_Method__has_error__Executable_returning_Element), errorElement);
+		}
+		return new InvokeWebServiceMethod(ih);
+	}
 }

mocha-dotnet/src/lib/Mocha.Core/Oop/Methods/InvokeWebServiceMethod.cs

@@ -0,0 +1,25 @@
+// Copyright (C) 2025 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of Mocha.NET.
+// 
+// Mocha.NET is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// Mocha.NET is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with Mocha.NET.  If not, see <https://www.gnu.org/licenses/>.
+
+
+namespace Mocha.Core.Oop.Methods;
+
+public class InvokeWebServiceMethod : MethodReturningInstanceSet
+{
+    public override Guid ClassId => KnownInstanceGuids.MethodClasses.InvokeWebServiceMethod;
+    internal InvokeWebServiceMethod(InstanceHandle handle) : base(handle) { }
+}

mocha-dotnet/tests/Mocha.Core.Tests/MethodTests/InvokeWebServiceMethodTests.cs

@@ -0,0 +1,119 @@
+using System;
+using Mocha.Core.Oop;
+using Mocha.Core.Oop.Methods;
+
+namespace Mocha.Core.Tests.MethodTests;
+
+public class InvokeWebServiceMethodTests : MethodTestsBase
+{
+	private InstanceHandle BuildFormViewPageElement(IInstanceReference sourceInstance, InstanceHandle titleInstance, IEnumerable<InstanceHandle> subeditInstances)
+	{
+		InstanceHandle subeditElement = Oms.CreateInstanceOf(Oms.GetInstance(KnownInstanceGuids.Classes.Element));
+
+		List<InstanceHandle> subedits = new List<InstanceHandle>();
+
+		// the first EC in a subedit element is the source instance
+		InstanceHandle sourceInstanceEC = Oms.CreateInstanceOf(Oms.GetInstance(KnownInstanceGuids.Classes.ElementContent));
+		Oms.AssignRelationship(sourceInstanceEC, Oms.GetInstance(KnownRelationshipGuids.Element_Content__has__Element_Content_Display_Option), Oms.GetInstance(KnownInstanceGuids.ElementContentDisplayOptions.DoNotShow));
+		Oms.AssignRelationship(sourceInstanceEC, Oms.GetInstance(KnownRelationshipGuids.Element_Content__has__Instance), sourceInstance);
+		subedits.Add(sourceInstanceEC);
+
+		foreach (InstanceHandle subeditInstance in subeditInstances)
+		{
+			InstanceHandle ec = Oms.CreateInstanceOf(Oms.GetInstance(KnownInstanceGuids.Classes.ElementContent));
+			Oms.AssignRelationship(ec, Oms.GetInstance(KnownRelationshipGuids.Element_Content__has__Instance), subeditInstance);
+			subedits.Add(ec);
+		}
+		Oms.AssignRelationship(subeditElement, Oms.GetInstance(KnownRelationshipGuids.Element__has__Element_Content), subedits);
+
+		InstanceHandle subeditElementContent = Oms.CreateInstanceOf(Oms.GetInstance(KnownInstanceGuids.Classes.ElementContent));
+		Oms.AssignRelationship(subeditElementContent, Oms.GetInstance(KnownRelationshipGuids.Element_Content__has__Instance), subeditElement);
+		Oms.AssignRelationship(subeditElementContent, Oms.GetInstance(KnownRelationshipGuids.Element_Content__has__Element_Content_Display_Option), new InstanceHandle[]
+		{
+			Oms.GetInstance(KnownInstanceGuids.ElementContentDisplayOptions.ShowSubelementsVertically),
+			Oms.GetInstance(KnownInstanceGuids.ElementContentDisplayOptions.Singular)
+		});
+
+		InstanceHandle element = Oms.CreateInstanceOf(Oms.GetInstance(KnownInstanceGuids.Classes.Element));
+
+		Oms.AssignRelationship(element, Oms.GetInstance(KnownRelationshipGuids.Element__has__Element_Content), new InstanceHandle[]
+		{
+			BuildAttributeElementContent(titleInstance, new InstanceHandle[]
+			{
+				Oms.GetInstance(KnownInstanceGuids.ElementContentDisplayOptions.DisplayAsPageTitle),
+				Oms.GetInstance(KnownInstanceGuids.ElementContentDisplayOptions.NotEnterable),
+				Oms.GetInstance(KnownInstanceGuids.ElementContentDisplayOptions.SubmitNotEnterable)
+			}),
+			subeditElementContent,
+			// approvalToolbar
+		});
+
+		return element;
+	}
+
+	private InstanceHandle BuildAttributeElementContent(InstanceHandle attributeInstance, IEnumerable<InstanceHandle>? displayOptions = null)
+	{
+		InstanceHandle ec = Oms.CreateInstanceOf(Oms.GetInstance(KnownInstanceGuids.Classes.DerivedElementContent));
+		Oms.AssignRelationship(ec, Oms.GetInstance(KnownRelationshipGuids.Element_Content__has__Instance), attributeInstance);
+		if (displayOptions != null)
+		{
+			Oms.AssignRelationship(ec, Oms.GetInstance(KnownRelationshipGuids.Element_Content__has__Element_Content_Display_Option), displayOptions);
+		}
+		return ec;
+	}
+
+	[Test]
+	public void Test1()
+	{
+		InstanceHandle a_UserName = Oms.GetInstance(KnownAttributeGuids.Text.UserName);
+		InstanceHandle a_Password = Oms.GetInstance(KnownAttributeGuids.Text.PasswordHash);
+		InstanceHandle a_DestinationURL = Oms.GetInstance(KnownAttributeGuids.Text.TargetURL);
+
+		InstanceHandle elem = BuildFormViewPageElement(c_TestClass, Oms.GetInstance(KnownAttributeGuids.Text.Name), new InstanceHandle[]
+		{
+			a_UserName,
+			a_Password,
+			a_DestinationURL
+		});
+
+		Class c_Element = Oms.GetInstance<Class>(KnownInstanceGuids.Classes.Element);
+		Class c_ElementContent = Oms.GetInstance<Class>(KnownInstanceGuids.Classes.ElementContent);
+		GetAttributeMethod m_getOrder = Oms.MethodBuilder.CreateGetAttributeMethod(c_ElementContent, "get", "Order", Oms.GetInstance(KnownAttributeGuids.Text.Order));
+
+		WorkSet wsE = Oms.CreateWorkSet("temp");
+		ReturnAttributeMethodBinding Element_Content__get__Order = m_getOrder.CreateMethodBinding(Oms);
+
+		GetRelationshipMethod m_Element__get__Element_Contents = Oms.MethodBuilder.CreateGetRelationshipMethod(c_Element, "get", "Element Contents", AccessModifier.Public, Oms.GetInstance(KnownRelationshipGuids.Element__has__Element_Content));
+		ReturnInstanceSetMethodBinding Element__get__Element_Contents = m_Element__get__Element_Contents.CreateMethodBinding(Oms);
+
+		SelectFromInstanceSetMethod m_getFirstElementContent = Oms.MethodBuilder.CreateSelectFromInstanceSetMethod(Oms.GetInstance(KnownInstanceGuids.Classes.Element), "get", "First Element Content", AccessModifier.Public, false, wsE, Element__get__Element_Contents, null, Oms.GetInstance(KnownInstanceGuids.SelectionFunctions.First), Element_Content__get__Order);
+		ReturnInstanceSetMethodBinding getFirstElementContent = m_getFirstElementContent.CreateMethodBinding(Oms);
+
+		InstanceHandle bemp = Oms.CreateInstanceOf(Oms.GetInstance(KnownInstanceGuids.Classes.BEMProcess));
+		Oms.AssignRelationship(bemp, Oms.GetInstance(KnownRelationshipGuids.BEM_Process__uses_loop__Executable_returning_Instance_Set), getFirstElementContent);
+
+		BuildElementMethod bemError = Oms.MethodBuilder.CreateBuildElementMethod(c_TestClass, "build", "error element for IWS", AccessModifier.Public, false, bemp, elem);
+		ReturnElementMethodBinding bemErrorRemb = bemError.CreateMethodBinding(Oms);
+
+		MethodReturningAttribute m_UserName = Oms.MethodBuilder.CreateGetAttributeMethod(c_TestClass, "get", "User Name", a_UserName);
+		MethodReturningAttribute m_Password = Oms.MethodBuilder.CreateGetAttributeMethod(c_TestClass, "get", "Password", a_Password);
+		MethodReturningAttribute m_DestinationURL = Oms.MethodBuilder.CreateGetAttributeMethod(c_TestClass, "get", "Destination URL", a_DestinationURL);
+
+		InstanceHandle i_TestClass1 = Oms.CreateInstanceOf(c_TestClass);
+		Oms.SetAttributeValue(i_TestClass1, a_UserName, "superuser");
+		Oms.SetAttributeValue(i_TestClass1, a_Password, "J1gglyPuFF$");
+		Oms.SetAttributeValue(i_TestClass1, a_DestinationURL, "https://iwstestsvcs1-3200.sandbox.mochapowered.com/svc");
+
+		ReturnAttributeMethodBinding ramb_UserName = m_UserName.CreateMethodBinding(Oms);
+		ReturnAttributeMethodBinding ramb_Password = m_Password.CreateMethodBinding(Oms);
+		ReturnAttributeMethodBinding ramb_DestinationURL = m_DestinationURL.CreateMethodBinding(Oms);
+
+		InstanceHandle webServiceInvocationType = Oms.GetInstance(KnownInstanceGuids.WebServiceInvocationTypes.BasicAuth);
+
+		Method iws = Oms.MethodBuilder.CreateInvokeWebServiceMethod(c_TestClass, "invoke", "test Web Service", Core.Oop.AccessModifier.Public, false, ramb_UserName, ramb_Password, ramb_DestinationURL, webServiceInvocationType, null, null, bemErrorRemb);
+		OmsContext context = Oms.CreateContext();
+		context.SetWorkData(c_TestClass, i_TestClass1);
+		Oms.Execute(context, iws);
+	}
+
+}