[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Need a language whiz: An XML Schema "specifies" howdata is
Theoretically, although I have never seen it with XSD and would probably think it was a weird use of the language, you could have multiple schemas for validating documents in the same namespace. This is implied by some of the other emails in this thread, where one has a chain of validations, and each validation step in the chain narrowed the range of possible validation errors for the next step. Remembering Joe English's plea for sanity in the use of namespaces http://www.flightlab.com/~joe/sgml/sanity.txt I would say that this kind of validation chain if implemented using XSD for multiple validation steps might be defined as the full-blown OCD validation pattern. However it is totally a reasonable way of validating documents with a schematron solution, to route the documents into the right department for handling documents that are overall valid, but need some extra checking. When done using schematron it is the slightly anal validation pattern. Cheers, Bryan Rasmussen On Wed, Jan 3, 2018 at 5:24 PM, Michael Kay <mike@saxonica.com> wrote: > The essence of the semantics of XSD is that the specification defines a process, variously called "validation" or "assessment", that takes a schema and an instance document as input and produces an assessment outcome as its result. > > assess(schema, instance) => outcome > > (It's slightly more complicated than that because you can specify other inputs to the assessment, e.g. strict/lax). > > The specification does not use any specific term (such as "describes" or "constrains") for the relationship between a schema and the set of instance documents for which assessment has an outcome labeled "valid". You're perfectly welcome to use a term such as "describes" for this relationship if you wish, but it's not a term-of-art in XSD itself; so if you use it, you should say carefully what you mean by it. > > Michael Kay > Saxonica > > >> On 3 Jan 2018, at 14:40, bryan rasmussen <rasmussen.bryan@gmail.com> wrote: >> >> The word choices betray viewpoints of reality - >> stating or specifying how data is to be structured assumes a blank >> canvas and the schema tells you how that canvas may be filled >> constrains assumes that data is a realm of many, perhaps infinite >> possibilities, XML Schema then constrains or limits the possible to >> the manageable. >> >> I am a specifying how data is to be structured man myself. >> >> On Mon, Nov 13, 2017 at 2:13 PM, Costello, Roger L. <costello@mitre.org> wrote: >>> Hi Folks, >>> >>> >>> >>> Which of the following is most accurate and why? >>> >>> >>> >>> An XML Schema specifies how data is to be structured. >>> An XML Schema describes how data is to be structured. >>> An XML Schema states how data is to be structured. >>> An XML Schema constrains the structure of data. >>> An XML Schema structures data. >>> An XML Schema describes data. >>> An XML Schema constrains data. >>> Other (what?) >>> >>> >>> >>> /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@lists.xml.org >> subscribe: xml-dev-subscribe@lists.xml.org >> List archive: http://lists.xml.org/archives/xml-dev/ >> List Guidelines: http://www.oasis-open.org/maillists/guidelines.php >
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