the next <a href="libxml-SAX.html#attribute">attribute</a> if in a group ...
    const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> *	name
    const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> *	id
    const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> *	ref	: Deprecated; not used
    const <a href="libxml-xmlstring.html#xmlChar">xmlChar</a> *	refNs	: Deprecated; not used
    <a href="libxml-schemasInternals.html#xmlSchemaAnnotPtr">xmlSchemaAnnotPtr</a>	annot
    <a href="libxml-