categories without items

[Martin Lee <martin@xxxxxxxxxxxx>]

The element categories is defined as:
<!ELEMENT categories (item)* >

This implies we can have a categories element in the absence of any
items,
i.e. just an empty tag, <categories></categories>.

I can see no reason for explicitly allowing empty elements. Defining
categories as:
<!ELEMENT categories (item)+ >
forces categories, if present, to have at least one item of information.

Martin

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