PDFBOX-5660: improve exception messages

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1930225 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

xmpbox/src/main/java/org/apache/xmpbox/xml/DomXmpParser.java

@@ -938,22 +938,22 @@ private PropertyType checkPropertyDefinition(XMPMetadata xmp, QName prop) throws
         if (!nsFinder.containsNamespace(prop.getNamespaceURI()))
         {
             throw new XmpParsingException(ErrorType.NoSchema, "Schema is not set in this document : "
-                    + prop.getNamespaceURI());
+                    + prop.getNamespaceURI() + ", property: " + prop.getPrefix() + ":" + prop.getLocalPart());
         }
         // test if namespace is defined
         String nsuri = prop.getNamespaceURI();
         if (!tm.isDefinedNamespace(nsuri))
         {
             throw new XmpParsingException(ErrorType.NoSchema, "Cannot find a definition for the namespace "
-                    + prop.getNamespaceURI());
+                    + prop.getNamespaceURI() + ", property: " + prop.getPrefix() + ":" + prop.getLocalPart());
         }
         try
         {
             return tm.getSpecifiedPropertyType(prop);
         }
         catch (BadFieldValueException e)
         {
-            throw new XmpParsingException(ErrorType.InvalidType, "Failed to retrieve property definition", e);
+            throw new XmpParsingException(ErrorType.InvalidType, "Failed to retrieve property definition for " + prop, e);
         }
     }