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- <!-- This illustrates single pass idref validation. Note that the
- error message gives the line number of the invalid idref not of the
- end of file, even though the error is detected at the end of the file.
- -->
- <!doctype doc [
- <!element doc o o (foo*)>
- <!element foo - o empty>
- <!attlist foo
- id id #implied
- idref idrefs #implied
- >
- ]>
- <foo id=x>
- <foo idref=y>
- <foo idref=x>
- <!-- This should get an error: there is no z id -->
- <foo idref=z>
- <foo id=y>
- <foo idref=y>
- <foo id=w>
-