virtual void saxStartElement( message_info_t* ctx, const xmlChar* name, const xmlChar** attrs ) = 0;
virtual void saxEndElement( message_info_t* ctx, const xmlChar* name ) = 0;
virtual void saxCharacters( message_info_t* ctx, const xmlChar* ch, int len ) = 0;
virtual void saxStartElement( message_info_t* ctx, const xmlChar* name, const xmlChar** attrs ) = 0;
virtual void saxEndElement( message_info_t* ctx, const xmlChar* name ) = 0;
virtual void saxCharacters( message_info_t* ctx, const xmlChar* ch, int len ) = 0;