diff --git a/src/main/java/org/spdx/tools/schema/OwlToJsonSchema.java b/src/main/java/org/spdx/tools/schema/OwlToJsonSchema.java
index 7e3b2b0..62007bc 100644
--- a/src/main/java/org/spdx/tools/schema/OwlToJsonSchema.java
+++ b/src/main/java/org/spdx/tools/schema/OwlToJsonSchema.java
@@ -93,7 +93,8 @@ public ObjectNode convertToJsonSchema() {
 		ExtendedIterator<Ontology> ontologyIter = model.listOntologies();
 		if (ontologyIter.hasNext()) {
 			Ontology ont = ontologyIter.next();
-			String ontologyUri = ont.getURI();
+			String version = ont.getVersionInfo();
+			String ontologyUri = version == null ? ont.getURI() : ont.getURI() + "/" + version;
 			if (Objects.nonNull(ontologyUri)) {
 				root.put("$id", ontologyUri);
 			}
@@ -231,6 +232,10 @@ private void addClassProperties(OntClass spdxClass, ObjectNode jsonSchemaPropert
 			    jsonSchemaProperties.set(MultiFormatStore.propertyNameToCollectionPropertyName(
 						checkConvertRenamedPropertyName(property.getLocalName())),
 						deriveListPropertySchema(property, restrictions));
+			    if (!restrictions.isOptional() || restrictions.getMinCardinality() > 0) {
+			        required.add(MultiFormatStore.propertyNameToCollectionPropertyName(
+			        		checkConvertRenamedPropertyName(property.getLocalName())));
+			    }
 			} else {
 			    jsonSchemaProperties.set(checkConvertRenamedPropertyName(property.getLocalName()), derivePropertySchema(property, restrictions));
 			    if (!restrictions.isOptional()) {
@@ -322,9 +327,9 @@ private ObjectNode derivePropertySchema(OntProperty property, PropertyRestrictio
 				// check for AnyLicenseInfo - these are strings with the exception of the extractedLicensingInfos which are the actual license description
 				JsonNode description = propertySchema.get("description");
 				if (Objects.isNull(description)) {
-					propertySchema.put("description", "License expression");
+					propertySchema.put("description", "License expression.  See SPDX Annex D for the license expression syntax.");
 				} else {
-					propertySchema.put("description", "License expression for "+checkConvertRenamedPropertyName(property.getLocalName())+".  "+description.asText());
+					propertySchema.put("description", "License expression for "+checkConvertRenamedPropertyName(property.getLocalName())+". See SPDX Annex D for the license expression syntax.  "+description.asText());
 				}
 				propertySchema.put(JSON_RESTRICTION_TYPE, JSON_TYPE_STRING);
 			} else if (Objects.nonNull(clazz) && SpdxElement.class.isAssignableFrom(clazz)) {