4. Known problems and missing features
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## 4. Known problems and missing features

Known problems:

- `include` and `externalRef` elements in RELAX NG schemas are XML catalog aware, but the equivalent notations in the compact syntax are not XML catalog aware.

Missing features:

- An XXE configuration for editing RELAX NG schemas more comfortably[2].

- A format plug-in for the compact syntax (probably based on Trang, an excellent multi-format schema converter written by James Clark).

[2] It is already possible to open RELAX NG schemas (using the XML syntax) in XXE and automatically benefit from a full semantic validation.

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