A client interacts with APS Catalog by issuing HTTP GET/POST requests, and retrieving HTTP packets with status codes and APS Catalog resources. A resource can be a binary file (for example, a package) or an XML-based message. Each XML message conforms to one of the following formats:
- Atom feed [RFC 4287] with the following extensions:
- OpenSearch 1.1
- Feed paging [RFC 5005]
- Native APS Catalog extensions describing APS package metadata
- XHTML format that describes APS catalog structure.
- Native XML-based format that describes APS catalog structure. For details, refer to the APS Catalog Resources section further in this guide.
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