Really? dev_guide.pdf
4.2 Collections Versus Directories Collections are used to organize documents in a database. You can also use directories to organize documents in a database. The key differences in using collections to organize documents versus using directories are: • Collections do not require member documents to conform to any URI patterns. They are not hierarchical; directories are. Any document can belong to any collection, and any document can also belong to multiple collections. • You can delete all documents in a collection with the xdmp:collection-delete() function. Deleting a directory does not delete the documents in the directory (unless you use a WebDAV client to delete a directory). • You cannot set properties on a collection; you can on a directory. Except for the fact that you can use both collections and directories to organize documents, collections are unrelated to directories. For details on directories, see “Properties Documents and Directories” on page 98.
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