This is needed to handle XML comments and the like. If the
lexical handler is not set, an attempt should be made by the
transformer to cast the
org.xml.sax.ContentHandler to a
LexicalHandler.
Parameters: handler - A non-null LexicalHandler forhandling lexical parse events.
Method setSystemId Set the systemID that may be used in association
with the
org.xml.sax.ContentHandler .
Parameters: systemId - The system identifier as a URI string.