Add xml langString into vocabulary

Author: michelu89

src/instantiator/characteristic/enumeration-characteristic-instantiator.ts

@@ -133,7 +133,8 @@ export class EnumerationCharacteristicInstantiator extends CharacteristicInstant
             return this.solveBlankNodeValues([...resolvedBlankNodes]);
         }
 
-        if ((quad.object as any).datatypeString === Samm.LANG_STRING) {
+        if (((quad.object as any).datatypeString === Samm.RDF_LANG_STRING) ||
+            ((quad.object as any).datatypeString === Samm.XML_LANG_STRING)) {
             return this.createLanguageObject(quad);
         }
 

src/vocabulary/samm.ts

@@ -19,7 +19,8 @@ export class Samm {
     static readonly RDFS_URI = 'http://www.w3.org/2000/01/rdf-schema';
     static readonly BASE_URI = 'urn:samm:org.eclipse.esmf.samm:';
 
-    static readonly LANG_STRING = `${Samm.RDF_URI}#langString`;
+    static readonly RDF_LANG_STRING = `${Samm.RDF_URI}#langString`;
+    static readonly XML_LANG_STRING = `${Samm.XSD_URI}#langString`;
 
     private alias = 'samm';