8134861: XSLT: Extension func call cause exception if namespace URI contains partial package name

Reviewed-by: joehw
diff --git a/jaxp/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/compiler/FunctionCall.java b/jaxp/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/compiler/FunctionCall.java
index 03a7498..fefb5d1 100644
--- a/jaxp/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/compiler/FunctionCall.java
+++ b/jaxp/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/compiler/FunctionCall.java
@@ -932,9 +932,9 @@
                     //Check if FSP and SM - only then process with loading
                     if (namespace != null && isSecureProcessing
                             && isExtensionFunctionEnabled
-                            && (namespace.equals(JAVA_EXT_XALAN)
-                            || namespace.equals(JAVA_EXT_XSLTC)
-                            || namespace.equals(JAVA_EXT_XALAN_OLD)
+                            && (namespace.startsWith(JAVA_EXT_XALAN)
+                            || namespace.startsWith(JAVA_EXT_XSLTC)
+                            || namespace.startsWith(JAVA_EXT_XALAN_OLD)
                             || namespace.startsWith(XALAN_CLASSPACKAGE_NAMESPACE))) {
                         _clazz = getXSLTC().loadExternalFunction(_className);
                     } else {