This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
> In my opinion, THREDDS should develop a shared XML framework in order > to realise middleware components and make systems interoperable. > [...] > 1) Service discovery level (UDDI); 2) Service description level > (WSDL); 3) Web services level (XML Protocol, ebXML, SOAP); 4) Data > format specification level (DTD, XML Schema, XMI); 5) Data > representation level (XML, XML namespaces); 6) Communication protocol > level (TCP/IP, HTTP, SMTP, FTP). FYI, the OpenGIS Consortium is presently starting to address these XML issues with vigor at both the service level (using UDDI, WSDL, SOAP) and XML file formats for data (using DTDs and XML Schema for Geographic Markup Language [GML], ArcXML [by ESRI], LandXML(?) [by someone else]). It would be wise of THREDDS to participate in or align with this process. -Jeff DLB Dr Jeff de La Beaujardiere NASA Goddard Space Flight Center * Code 933 address@hidden * +1 301 286 1569 Digital Earth * www.digitalearth.gov