Code example for Hashtable

Methods: keys

        if (prefixTable == null) {
            return EMPTY_ENUMERATION;
        } else { 
            return prefixTable.keys();
    // Internal methods. 
     * Copy on write for the internal tables in this context. 
     * <p>This class is optimized for the normal case where most 
     * elements do not contain Namespace declarations. In that case, 
     * the Context2 will share data structures with its parent. 
     * New tables are obtained only when new declarations are issued, 
     * so they can be popped off the stack.</p> 
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