| <?xml version="1.0"?> | |
| <grammar ns="http://www.example.com/choice" | |
| xmlns="http://relaxng.org/ns/structure/1.0"> | |
| <start> | |
| <element name="doc" ns=""> | |
| <ref name="elem"/> | |
| <optional> | |
| <ref name="elem"/> | |
| <optional> | |
| <ref name="elem"/> | |
| </optional> | |
| </optional> | |
| </element> | |
| </start> | |
| <define name="elem"> | |
| <element name="elem" ns=""> | |
| <text/> | |
| </element> | |
| </define> | |
| </grammar> |