wsusscn.cab package..xml structure and attributes explanation

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Windows

updater

I'm trying to understand the structure and attributes of the window's package.xml file obtained after downloading and uncompressed wsusscn.cab. The resulting package.xml file should contain all Microsoft patches that are targeted towards that particular windows distribution, both installed and uninstalled. I can't yet find a document explaining or describing it structure and attributes. I would greatly appreciate any useful information on that matter. Thanks.