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In the moki, an external stylesheet should be flagged as such with a type="external" attribute. The attribute does not appear when the mime type is unknown (and thus when the Checker does not try to decode the received content as CSS).
The type="external" attribute is now added by default in Resource.java. Note that, in a perfect world, the attribute would not be specific to stylesheets, and type="external" would thus be the default value for any kind of content. Changes in XSLT tests would be required for that to be done though.