Wednesday, May 9, 2012

XML-binary Optimized Packaging (XOP)

  • An XML document has an information set if it is well-formed and satisfies the namespace constraints.
  • XML-binary Optimized Packaging (XOP) convention, a means of more efficiently serializing XML Infosets.
  • A XOP package is created by placing a serialization of the XML Infoset inside of an extensible packaging format (such a MIME Multipart)
  • Then, selected portions of its content that are base64-encoded binary data are extracted and re-encoded (i.e., the data is decoded from base64) and placed into the package.
  • necessary to have a one to one correspondence between XML Infosets and XOP Packages, hence binary data is base64-encoded
How it works?
Architecture of the XOP framework

  • Original XML Infoset - An XML Infoset to be optimized.
  • Optimized Content - Content which has been removed from the XML Infoset.
  • XOP Infoset - The Original Infoset with any Optimized Content removed and replaced by xop:Include element information items.
  • XOP Document - A serialization of the XOP Infoset using any W3C recommendation-level version of XML.
  • XOP Package - A package containing the XOP Document and any Optimized Content. As a whole, the XOP Package is an alternate serialization of the Original Infoset.
  • Reconstituted XML Infoset - An XML Infoset that has been constructed from the parts of a XOP Package.