add missing xmlTagName function for ranked_symbol

alib2data/src/alphabet/RankedSymbol.h

@@ -146,6 +146,7 @@ template < typename T, typename R >
 struct xmlApi < common::ranked_symbol < T, R > > {
 	static common::ranked_symbol < T, R > parse ( ext::deque < sax::Token >::iterator & input );
 	static bool first ( const ext::deque < sax::Token >::const_iterator & input );
+	static std::string xmlTagName ( );
 	static void compose ( ext::deque < sax::Token > & output, const common::ranked_symbol < T, R > & data );
 };
@@ -159,6 +160,11 @@ bool xmlApi < common::ranked_symbol < T, R > >::first ( const ext::deque < sax::
 	return sax::FromXMLParserHelper::isToken ( input, sax::Token::TokenType::START_ELEMENT, alphabet::RankedSymbol < T, R >::getXmlTagName() );
 }
+template < typename T, typename R >
+std::string xmlApi < common::ranked_symbol < T, R > >::xmlTagName ( ) {
+	return alphabet::RankedSymbol < T, R >::getXmlTagName();
+}
+
 template < typename T, typename R >
 void xmlApi < common::ranked_symbol < T, R > >::compose ( ext::deque < sax::Token > & output, const common::ranked_symbol < T, R > & input ) {
 	return alphabet::RankedSymbol < T, R >::compose( output, input );