--- a/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/xs/traversers/SchemaContentHandler.java	Mon Apr 23 18:14:35 2018 +0200
+++ b/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/xs/traversers/SchemaContentHandler.java	Tue Oct 31 11:35:15 2017 -0700
@@ -26,6 +26,7 @@
 import com.sun.org.apache.xerces.internal.util.SAXLocatorWrapper;
 import com.sun.org.apache.xerces.internal.util.SymbolTable;
 import com.sun.org.apache.xerces.internal.util.XMLAttributesImpl;
+import com.sun.org.apache.xerces.internal.util.XMLStringBuffer;
 import com.sun.org.apache.xerces.internal.util.XMLSymbols;
 import com.sun.org.apache.xerces.internal.xni.NamespaceContext;
 import com.sun.org.apache.xerces.internal.xni.QName;
@@ -78,6 +79,7 @@
     private final QName fAttributeQName = new QName();
     private final XMLAttributesImpl fAttributes = new XMLAttributesImpl();
     private final XMLString fTempString = new XMLString();
+    private final XMLStringBuffer fStringBuffer = new XMLStringBuffer();
 
     /**
      * <p>Constructs an SchemaContentHandler.</p>
@@ -103,6 +105,7 @@
      */
     public void startDocument() throws SAXException {
         fNeedPushNSContext = true;
+        fNamespaceContext.reset();
         try {
             fSchemaDOMParser.startDocument(fSAXLocatorWrapper, null, fNamespaceContext, null);
         }
@@ -326,7 +329,11 @@
             if (nsPrefix.length() > 0) {
                 prefix = XMLSymbols.PREFIX_XMLNS;
                 localpart = nsPrefix;
-                rawname = fSymbolTable.addSymbol(prefix + ":" + localpart);
+                fStringBuffer.clear();
+                fStringBuffer.append(prefix);
+                fStringBuffer.append(':');
+                fStringBuffer.append(localpart);
+                rawname = fSymbolTable.addSymbol(fStringBuffer.ch, fStringBuffer.offset, fStringBuffer.length);
             }
             else {
                 prefix = XMLSymbols.EMPTY_STRING;
@@ -334,7 +341,8 @@
                 rawname = XMLSymbols.PREFIX_XMLNS;
             }
             fAttributeQName.setValues(prefix, localpart, rawname, NamespaceContext.XMLNS_URI);
-            fAttributes.addAttribute(fAttributeQName, XMLSymbols.fCDATASymbol, nsURI);
+            fAttributes.addAttribute(fAttributeQName, XMLSymbols.fCDATASymbol,
+                    (nsURI != null) ? nsURI : XMLSymbols.EMPTY_STRING);
         }
     }
 

--- a/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/xs/traversers/XSDHandler.java	Mon Apr 23 18:14:35 2018 +0200
+++ b/src/java.xml/share/classes/com/sun/org/apache/xerces/internal/impl/xs/traversers/XSDHandler.java	Tue Oct 31 11:35:15 2017 -0700
@@ -2266,6 +2266,8 @@
                             fSecurityManager.isSecureProcessing());
 
                     try {
+                        parser.setFeature(NAMESPACE_PREFIXES, true);
+                        namespacePrefixes = true;
                         // If this is a Xerces SAX parser set the security manager if there is one
                         if (parser instanceof SAXParser) {
                             if (fSecurityManager != null) {