Subject: Re: [xsl] Issues with xs:error in the XPath 3.0 and XDM 3.0 Recommendations. From: Dimitre Novatchev <dnovatchev@xxxxxxxxx> Date: Sat, 19 Apr 2014 20:29:42 -0700 |
Thank you for these examples. On Sat, Apr 19, 2014 at 7:38 PM, Graydon <graydon@xxxxxxxxx> wrote: > On Sat, Apr 19, 2014 at 06:42:01PM -0700, Dimitre Novatchev scripsit: >> To put it in other words: Why was the xs:error type introduced (in >> XML Schema)? What purpose does it serve? What problems does it solve? > > http://lists.w3.org/Archives/Public/xmlschema-dev/2009Jul/0045.html (and > the rest of the thread) may be of interest. > > xs:error would appear to be a result of conditional type assignment and > to allow > > <element name="element" type="element"> > <alternative test="@name" type="localElement"/> > <alternative test="@ref" type="elementRef"/> > <alternative type="error"/> > </element> > > as a way to define the schema "element" element, so that it must have a > name or a ref. This is not something XSD 1.0 would allow. > > There's also a case where you're using subset V of large shared > vocabulary P, and want to forbid element E in V when it is optional in P; > > <override schemaLocation="main.path.to.V"> > <element name="E" type="error"/> > <!--* other elements can be excluded here by the same method ... *--> > </override> > > That thread also has the cheerful acknowledgement that anything you can > do in XSD 1.1 with xs:error you can also do with assertions, but > xs:error is preferred for style and legibility. > > -- Graydon > -- Cheers, Dimitre Novatchev --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- Never fight an inanimate object ------------------------------------- To avoid situations in which you might make mistakes may be the biggest mistake of all ------------------------------------ Quality means doing it right when no one is looking. ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play ------------------------------------- To achieve the impossible dream, try going to sleep. ------------------------------------- Facts do not cease to exist because they are ignored. ------------------------------------- Typing monkeys will write all Shakespeare's works in 200yrs.Will they write all patents, too? :) ------------------------------------- I finally figured out the only reason to be alive is to enjoy it.
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