systemId           71 http/modules/ngx_http_xslt_filter_module.c     const xmlChar *externalId, const xmlChar *systemId);
systemId          369 http/modules/ngx_http_xslt_filter_module.c     const xmlChar *externalId, const xmlChar *systemId)
systemId          388 http/modules/ngx_http_xslt_filter_module.c                    systemId ? systemId : (xmlChar *) "");