#412 make first and second attribute of RelationshipElement optional

most changes were already done
- fix Value-Only schema
- fix ChangeLog again
- update figure for SME with inheritance
-

documentation/IDTA-01001/modules/ROOT/pages/IDTA-01001_ChangeLog.adoc

@@ -48,6 +48,7 @@ Major Changes:
 * Data type  Identifier: change length from 2000 to 2048 characters (https://github.com/admin-shell-io/aas-specs/issues/306[#306])
 * Referable/idShort and Constraint AASd-002: now also allows hyphens to be included in name (https://github.com/admin-shell-io/aas-specs/issues/295[#295])
 * Entity/entityType and Constraint AASd-014: entityType now optional (https://github.com/admin-shell-io/aas-specs/issues/287[#287])
+* Change RelationshipElement: attributes "first" and "second" now optional (conformant to "min" and "max" of "Range")(https://github.com/admin-shell-io/aas-specs/issues/412[#412]), AnnotatedRelationshipElement inherits from RelationshipElement and is thus also affected.
 * Relaxation of grammar for semantic IDs for metamodel elements in the context of data specifications
 (https://github.com/admin-shell-io/aas-specs/issues/307[#307])
 * Terms and Definitions adopted to IEC 63278-1:2023 (before IEC 63278-1 Draft July 2022 was the basis), 
@@ -93,13 +94,14 @@ Minor Changes:
 |*Nc* |*V3.1 Change w.r.t. V3.0* |*Comment*
 
 
-|{empty}  | xref:Spec/IDTA-01001_Metamodel_Core.adoc#AssetKind[AssetKind] a| Add new value "Role" to enumeration AssetKind
+| {empty} | xref:Spec/IDTA-01001_Metamodel_Core.adoc#AssetKind[AssetKind] a| Add new value "Role" to enumeration AssetKind
 | {empty} | xref:Spec/IDTA-01001_Metamodel_SubmodelElements.adoc#Entity[Entity/entityType] a| now optional
 | {empty} | xref:Spec/IDTA-01001_Metamodel_DataTypes.adoc#Identifier[Identifier] a| data type: change length from 2000 to 2024 characters
 | {empty} | xref:Spec/IDTA-01001_Metamodel_DataTypes.adoc#NameType[NameType] a| implicit change due to change of Constraint AASd-002
 | {empty} | xref:Spec/IDTA-01001_Metamodel_DataTypes.adoc#PathType[PathType] a| extend data type to support complete URI scheme for files RFC2396
 |{empty}  | xref:Spec/IDTA-01001_Metamodel_Common.adoc#Referable[Referable/idShort] a| implicit change because constraint AASd-002 now also allows hyphen
-
+| {empty} | xref:Spec/IDTA-01001_Metamodel_SubmodelElements.adoc#RelationshipElement[RelationshipElement/first] a| now optional
+| {empty} | xref:Spec/IDTA-01001_Metamodel_SubmodelElements.adoc#RelationshipElement[RelationshipElement/second] a| now optional
 
 |===
 

documentation/IDTA-01001/modules/ROOT/pages/includes/IDTA-01001_ValueOnly.adoc

@@ -489,10 +489,6 @@ See Annex B for an example that validates against this schema.
           }
         }
       },
-      "required": [
-        "first",
-        "second",
-      ],
       "additionalProperties": false
     },
     "BasicEventElementValue": {
@@ -669,10 +665,6 @@ See Annex B for an example that validates against this schema.
           "$ref": "#/definitions/ReferenceValue"
         }
       },
-      "required": [
-        "first",
-        "second"
-      ],
       "additionalProperties": false
     },
     "SpecificAssetIdValue": {