[dsdl-comment] Once or twice? (NVDL)

All,

Consider the following NVDL script. Note that there are two validate
actions. They reference to the same schema.

<rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0"
  xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0">
    <namespace ns="http://www.example.com">
        <validate schema="foo.rng"/>
        <validate schema="foo.rng"/>
    </namespace>
</rules>

Are there any implementations that validate the document ONLY ONCE?
Or, do all implementations valite the document twice?

Cheers,

-- 
MURATA Makoto <murata@hokkaido.email.ne.jp>
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