[relax-ng-comment] Other separators for list element

[pwilson@gorge.net (Peter Wilson)]

I am trying to code the Mozilla XUL syntax into a Relax NG schema.

XUL uses the <list> concept, but the values are separated by commas -
not spaces.

May I suggest an extension of the <list> pattern, as follows:

<list listseparator="regexp">
...
</list>
e.g.
<list listseparator="/,\s*/">  a comma plus whitespace.

If the regexp followed the Javascript or Pearl syntax, lists of any
reasonable type of list could be constructed.
List content could then be easily obtained with the
    arrayOfListItems = string.split(regexp) idiom in Javascript.