html5 resolve problem in build

xml/impl/src/com/intellij/psi/impl/source/xml/XmlDocumentImpl.java

@@ -240,7 +240,7 @@ public class XmlDocumentImpl extends XmlElementImpl implements XmlDocument {
     return null;
   }
 
-  private XmlNSDescriptor getNsDescriptorFormDocType(final XmlDoctype doctype, final XmlFile containingFile) {
+  XmlNSDescriptor getNsDescriptorFormDocType(final XmlDoctype doctype, final XmlFile containingFile) {
     XmlNSDescriptor descr = null;
     if (doctype.getMarkupDecl() != null){
       descr = (XmlNSDescriptor)doctype.getMarkupDecl().getMetaData();

xml/impl/src/com/intellij/psi/impl/source/xml/XmlTagImpl.java

@@ -191,11 +191,12 @@ public class XmlTagImpl extends XmlElementImpl implements XmlTag {
     if (document == null) {
       return null;
     }
-    final String url = XmlUtil.getDtdUri(document);
-    if (url == null) {
-      return null;
+
+    XmlDoctype docType = XmlUtil.getDocType(document);
+    if (document instanceof XmlDocumentImpl && docType != null) {
+      return ((XmlDocumentImpl)document).getNsDescriptorFormDocType(docType, containingFile);
     }
-    return document.getDefaultNSDescriptor(url, true);
+    return null;
   }
 
   public boolean isEmpty() {

xml/impl/src/com/intellij/xml/util/XmlUtil.java

@@ -945,13 +945,13 @@ public class XmlUtil {
 
   @Nullable
   public static String getDtdUri(XmlDocument document) {
-    if (document.getProlog() != null) {
-      final XmlDoctype doctype = document.getProlog().getDoctype();
-      if (doctype != null) {
-        return doctype.getDtdUri();
-      }
-    }
-    return null;
+    XmlDoctype docType = getDocType(document);
+    return docType != null ? docType.getDtdUri() : null;
+  }
+
+  public @Nullable static XmlDoctype getDocType(XmlDocument document) {
+    XmlProlog prolog = document.getProlog();
+    return prolog != null ? prolog.getDoctype():null;
   }
 
   private static void computeTag(XmlTag tag,