private OMElement resolveImports(
     OMElement grammarsElement, String wadlBaseUri, String wadlVersion) throws RegistryException {
   String wadlNamespace = grammarsElement.getNamespace().getNamespaceURI();
   Iterator<OMElement> grammarElements =
       grammarsElement.getChildrenWithName(new QName(wadlNamespace, "include"));
   while (grammarElements.hasNext()) {
     OMElement childElement = grammarElements.next();
     OMAttribute refAttr = childElement.getAttribute(new QName("href"));
     String importUrl = refAttr.getAttributeValue();
     if (importUrl.endsWith(".xsd")) {
       if (!importUrl.startsWith("http")) {
         if (registry.resourceExists(importUrl)) {
           continue;
         } else {
           if (wadlBaseUri != null) {
             importUrl = wadlBaseUri + importUrl;
           }
         }
       }
       String schemaPath = saveSchema(importUrl, wadlVersion);
       importedSchemas.add(schemaPath);
       refAttr.setAttributeValue(schemaPath);
       childElement.addAttribute(refAttr);
     }
   }
   return grammarsElement;
 }