     |
Linking Scorecard
| Language Feature | DTDs | RELAX NG | Schematron | W3C XML Schemas |
|---|---|---|---|---|
| Simple links | Yes | Some[a] | Yes | Yes |
| Typed links | No | No | Yes | Some[b] |
| ID-type element content | No | No | Yes | Yes |
|
[a] Only with RELAX NG DTD Compatibility. [b] Requires explicit hierarchy |
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