code: public void evaluate(XPathContext xctxt, FastStringBuffer buf,
                         int context,
                         org.apache.xml.utils.PrefixResolver nsNode)
    {
      buf.append(m_val);
    }
docs: Write the value into the buffer.
  
  @param xctxt An XPathContext object, providing infomation specific
  to this invocation and this thread. Maintains SAX state, variables,
  error handler and  so on, so the transformation/XPath object itself
  can be simultaneously invoked from multiple threads.
  @param buf Buffer to write into.
  @param context The current source tree context.
  @param nsNode The current namespace context (stylesheet tree context).