[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Requirements on validation: (1) combine schemas, (2) divid
Roger Costello wrote: > - It should be possible to divide non-monolithic documents into pieces > and then validate each piece against one of the schemas. > (divide-and-validate) > > Do existing schema languages meet these requirements? > > - No, you have to understand all schemas very well and change them. > - No, you have to validate the entire document against the combination > of all schemas. > > - W3C XML Schema > - RELAX NG I don't think you've accurately characterised the XSD language. You can, to a significant degree, to incremenal validation if your validator supports it. First of all, you can get a degree of modularity by using facilities like xs:include. So, if you have an "outer" schema that includes a bunch of "inner" pieces, you can also often do validations using just the inner bits by identifying one or more of the inner schema documents to your schema processor when that's what you want. Furthermore, the Recommendation makes clear that [1]: "With a schema which satisfies the conditions expressed in Errors in Schema Construction and Structure (§5.1) above, the schema-validity of an element information item can be assessed. " Note that the above does not refer to an entire XML document, but to a given element. Of course, most validators take the option of validating whole documents and starting with the root, but that's not required. You can in principle start with any element in the tree. XSD does this in part so you can divide things, as Murata-san suggests, and in part so that tools like editors can do incremental revalidation as small parts of a document change. The same section [1] points out that you can, in principle, identify any global element declaration or complex type to use in validating the element information item you've chosen. I'm not saying that all of this provides everything that you or Murata-san might want, but it's a little strong to say that XSD does not meet the requirement at all. Noah [1] http://www.w3.org/TR/2004/PER-xmlschema-1-20040318/#validation_outcome -------------------------------------- Noah Mendelsohn IBM Corporation One Rogers Street Cambridge, MA 02142 1-617-693-4036 -------------------------------------- "Costello, Roger L." <costello@m...> 04/27/2008 04:33 PM To: <xml-dev@l...> cc: (bcc: Noah Mendelsohn/Cambridge/IBM) Subject: Requirements on validation: (1) combine schemas, (2) divide a document into pieces and validate each piece, (3) use different schema languages, (4) validators work together Hi Folks, Here are a few snippets from slides by MURATA Makoto: Requirements on validation#1 - It should be possible to combine schemas representing vocabularies easily. - It should be possible to divide non-monolithic documents into pieces and then validate each piece against one of the schemas. (divide-and-validate) Do existing schema languages meet these requirements? - No, you have to understand all schemas very well and change them. - No, you have to validate the entire document against the combination of all schemas. - W3C XML Schema - RELAX NG Requirements on validation#2 - It should be possible to use different schema languages for different vocabularies. - Validators for many schema languages should work together. Do existing schema languages meet these requirements? - No, you are forced to use one schema language. - No, you have to use one validator. - W3C XML Schema - RELAX NG More... www.asahi-net.or.jp/~eb2m-mrt/svgopen/200409SVGOpen.ppt /Roger _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@l... subscribe: xml-dev-subscribe@l... List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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