Container Standard

I am looking for a container XML standard. This standard should be able to contain multiple Items, which are defined in XML themselves. Ideally this standard would also allow from grouping Items into folders and subfolders. You might call this a List standard as well. The standard should also allow for the annotation of the entire list and each folder.

The only candidates that I am aware are RSS and OPML. But RSS does not really allow for XML-items, although only can put anything into an item-field. And RSS does not allow for folders. OPML is great for folders and one could put an XML-file into an attribute, but that is not really very nice.

Categories/tags: format
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