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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Objections to / uses of PSVI?
Whew! What a trail! And perhaps the most straight-forwardly definite thing
I've seen so far, from 1.13.5 of the XML Schema part 1 Rec, which I've now
found with the help of Jeni's pointers:
"3.13.5 Annotation Information Set Contributions
None as such: the addition of annotations to the post-schema-validation
infoset is covered by the post-schema-validation infoset contributions of
the enclosing components."
Thanks,
Tom P
Jeni Tennison wrote
> Hi Tom,
>
> > It's not clear to me that appinfo is considered part of the element
> > declaration
>
> If you have a look at Section 3.3.1 of XML Schema Structures at
> http://www.w3.org/TR/xmlschema-1/#Element_Declaration_details, you'll
> see the description of the Element Declaration Schema Component. This
> lists a number of properties:
>
> {name}
> An NCName as defined by [XML-Namespaces].
> {target namespace}
> Either ·absent· or a namespace name, as defined in [XML-Namespaces].
> {type definition}
> Either a simple type definition or a complex type definition.
> {scope}
> Optional. Either global or a complex type definition.
> {value constraint}
> Optional. A pair consisting of a value and one of default, fixed.
> {nillable}
> A boolean.
> {identity-constraint definitions}
> A set of constraint definitions.
> {substitution group affiliation}
> Optional. A top-level element definition.
> {substitution group exclusions}
> A subset of {extension, restriction}.
> {disallowed substitutions}
> A subset of {substitution, extension, restriction}.
> {abstract}
> A boolean.
> {annotation}
> Optional. An annotation.
>
> That bottom one there is {annotation}. If you skip down to Section
> 3.13.1 at http://www.w3.org/TR/xmlschema-1/#Annotation_details, you'll
> see the description of the Annotation Schema Component. It lists a
> number of properties:
>
> {application information}
> A sequence of element information items.
> {user information}
> A sequence of element information items.
> {attributes}
> A sequence of attribute information items.
>
> Further down (Section 3.13.2) it says that when an xs:annotation
> element is translated into an Annotation Schema Component, the
> {application information} property is:
>
> A sequence of the <appinfo> element information items from among the
> [children], in order, if any, otherwise the empty sequence.
>
> How do these schema components get into the PSVI? Well, if you skip to
> Section 3.3.5, the Schema Information Set Contribution: Element
> Declaration (http://www.w3.org/TR/xmlschema-1/#sic-elt-decl) states
> that each element information item in the PSVI has either an [element
> declaration] or a [nil] property. If it has the [element declaration]
> property then the value of this property is:
>
> an ·item isomorphic· to the declaration component itself
>
> That "item isomorphic" stuff means that there's an information item in
> the PSVI that has the same properties as the element declaration
> schema component -- it has an [annotation] property, for example,
> which holds an item isomorphic to the annotation schema component, and
> thus has a [application information] property, which holds a sequence
> of element information items.
>
> > - in your example it contained a lookup table that the schema
> > processor wouldn't know anything about. I've always assumed that
> > appinfo was outside of the schema-known information about the
> > element. I can understand an argument that it should be included,
> > but I haven't found anything so far that actually says so.
>
> The schema validator doesn't know what to do with the [annotation]
> component of the element declaration, but that doesn't mean it throws
> the information away. It retains it as a bit of XML, specifically so
> that applications that use the PSVI can access that application
> information if they want to.
>
> Say that there was a DOM interface to the PSVI -- I'd expect to be
> able to do something like:
>
> Element ele = document.getDocumentElement();
> if (!ele.isNil()) {
> ElementDeclaration decl = ele.getElementDeclaration();
> if (decl.hasAnnotation()) {
> Annotation ann = decl.getAnnotation();
> NodeList appinfo = ann.getApplicationInformation();
> }
> }
>
> Each of the nodes in the appinfo nodelist being a xs:appinfo element
> node.
>
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