diff --git a/bundles/org.eclipse.epsilon.emc.rdf.dt/src/org/eclipse/epsilon/emc/rdf/dt/RDFModelConfigurationDialog.java b/bundles/org.eclipse.epsilon.emc.rdf.dt/src/org/eclipse/epsilon/emc/rdf/dt/RDFModelConfigurationDialog.java
index a821e99..df48e28 100644
--- a/bundles/org.eclipse.epsilon.emc.rdf.dt/src/org/eclipse/epsilon/emc/rdf/dt/RDFModelConfigurationDialog.java
+++ b/bundles/org.eclipse.epsilon.emc.rdf.dt/src/org/eclipse/epsilon/emc/rdf/dt/RDFModelConfigurationDialog.java
@@ -394,8 +394,8 @@ public void verifyText(VerifyEvent event) {
 				if (text.length() > 0) {
 					StringJoiner invalidTags = new StringJoiner(" "); 					
 					invalidTags.add("\nInvalid tags: ");
-					for (String tag : text.split(",")) {						
-						if (!bcp47Validator(tag)) {
+					for (String tag : text.split(",")) {	
+						if (!RDFModel.isValidLanguageTag(tag)) {
 							invalidTags.add(tag);								
 						}
 					}
@@ -412,11 +412,6 @@ public void verifyText(VerifyEvent event) {
 		return groupContent;
 	}
 	
-	public boolean bcp47Validator (String bcp47tag) {
-		boolean isValidBCP47 = !("und".equals(Locale.forLanguageTag(bcp47tag).toLanguageTag()));
-		return isValidBCP47;
-	}
-	
 	@Override
 	protected void loadProperties(){
 		super.loadProperties();
diff --git a/bundles/org.eclipse.epsilon.emc.rdf/src/org/eclipse/epsilon/emc/rdf/RDFModel.java b/bundles/org.eclipse.epsilon.emc.rdf/src/org/eclipse/epsilon/emc/rdf/RDFModel.java
index 4a771b3..1b62e64 100644
--- a/bundles/org.eclipse.epsilon.emc.rdf/src/org/eclipse/epsilon/emc/rdf/RDFModel.java
+++ b/bundles/org.eclipse.epsilon.emc.rdf/src/org/eclipse/epsilon/emc/rdf/RDFModel.java
@@ -352,7 +352,8 @@ public String getPrefix(String namespaceURI) {
 		return model.getNsURIPrefix(namespaceURI);
 	}
 	
-	public boolean isValidLanguageTag (String bcp47tag) {
+	// Using Java's Locale class to check that tags conform to bcp47 structure
+	public static boolean isValidLanguageTag (String bcp47tag) {
 		boolean isValidBCP47 = !("und".equals(Locale.forLanguageTag(bcp47tag).toLanguageTag()));
 		return isValidBCP47;
 	}