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I have tested xs:assert in the working draft of XML Schema 1.1 as implemented in Saxon. It surprises me that we now can do anything in XML Schema directly, that we can do with Schematron. Except for Schematron's user-defined error messages and a nice report format. So this is my question. Is there any testing we can do with Schematron that we can't do in XML Schema 1.1 directly? If we also get user-defined error messages in XML Schema 1.1, for the xs:assert element something like: <xs:assert test="some checksum validation of ISBN number"> <xs:annotation> <xs:appinfo> <xs:error>Book {./title} has an invalid ISBN number {./@isbn}</xs:error> </xs:appinfo> </xs:annotation> </xs:assert> and even the same facilities for other error conditions, such as not satisfying a pattern or an enumeration, as suggested by Michael Kay in https://sourceforge.net/forum/message.php?msg_id=5819277 what would then be the raisons d'être for Schematron except for a nice validation report format and as an alternative to cumbersome XML Schema in some situations? Cheers, Jesper Tverskov http://www.xmlplease.com
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