code: public boolean containsExcludeResultPrefix(String prefix, String uri)
    {
      ElemTemplateElement parent = this.getParentElem();
      if(null != parent)
        return parent.containsExcludeResultPrefix(prefix, uri);
        
      return false;
    }
docs: Get whether or not the passed URL is contained flagged by
  the "extension-element-prefixes" property.  This method is overridden
  by {@link ElemLiteralResult#containsExcludeResultPrefix}.
  @see <a href="http://www.w3.org/TR/xslt#extension-element">extension-element in XSLT Specification</a>
  
  @param prefix non-null reference to prefix that might be excluded.
  
  @return true if the prefix should normally be excluded.