Trying to achieve something like this
ATTLIST employee role (leader|analyst|leader,analyst)
where I can't change it into an element; it needs to be an attribute.
It seems like DTD doesn't like commas in its expressions.
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Use spaces instead of commas. That's how html class attribute works. Though technically it's simply defined as a string rather than having any structure in the xhtml DTD – slebetman May 08 '15 at 03:05
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An attribute in XML cannot contain elements.
You're really going against the grain to try to add structure to attributes in any way. If you must do it, keep it simple: You can represent a list via space or comma-separated values. Going any further runs into requiring a separate micro-parser distinct from an XML parser just to parse the attribute values. It's not a good idea, and don't expect support from DTD beyond that which is provided by NMTOKENS, IDREFS, or ENTITIES
See also: XML Element vs XML Attribute
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1If you were using XML Schema to describe the document, then you could use a `list` type. – John Saunders May 08 '15 at 03:03
