Re: Re: XSLT 2.0: On xsl:sequence and xsl:copy-of
Hi Dave, >> The 'as' attribute indicates the data type of the variable. Its >> syntax is known as a SequenceType -- it describes a sequence of >> items. The items are described by an item type, which can be item() >> (any item), a node test or the name of an atomic type. The usual >> occurrence indicators (?, +, *) mean the usual things (0-or-1, >> 1-or-more, 0-or-more). >> >> So in this case the items in the sequence are elements (indicated >> by the node test "element()") > > ?? Which may be tested for using .... Jeni? I don't understand what you're asking? > Its the 'as' attribute on Mikes xsl:variable that determines it to be > an 'element' in this case? Yes, or at least partly. If you have an 'as' attribute on <xsl:variable> then it indicates the static type of the variable, but the variable itself can be of a more specific type. The "static type" is the type that the XSLT processor knows about when it first goes through the styelsheet, or an XSLT editor might be able to use: even without having an XML document to work on, the 'as' attribute tells you what type of value the variable must hold. For example, if I have: <xsl:variable name="foo" as="item()*">...</xsl:variable> then the static type, indicated by the 'as' attribute, is any number of any kind of item -- in other words, the variable could hold anything at all. If I have: <xsl:variable name="foo" as="xs:decimal" select="..." /> then the static type, indicated by the 'as' attribute, is a decimal number. Contrast this with the "dynamic type", which is the type of the actual value of the variable when you actually do the transformation on a particular XML document. For example, if you have: <xsl:variable name="foo" as="item()*"> <a /><b /><c /> </xsl:variable> then the static type is any number of any item but the value of the variable is a sequence of three elements. Similarly, if you have: <xsl:variable name="foo" as="xs:decimal" select="2" /> then the static type is a xs:decimal but the type of the variable's value is a xs:integer. As long as the dynamic type (the type of the value that the variable gets set to) is a subset of the static type (the type of the variable as declared by the 'as' attribute), you're OK. > Ok. So (and I think I've asked this before and Mike quoted ?I think? > xsd rec) where is the full list of ' data types' in the current raft > of specs? > > http://www.dpawson.co.uk/xsl/rev2/exampler.html#iof > lists the ones I guessed at. > > I couldn't find one, so I guess as with Dimitres 'misnaming', > I (we?) will be fumbling with data types until we've guessed them all? The SequenceType syntax is specified in the XPath 2.0 spec at: http://www.w3.org/TR/xpath20/#id-sequencetype It's impossible to give a complete list of sequence types because user-defined data types can be imported into a stylesheet from a schema, and of course there are infinite numbers of element and attribute names. However, to summarize, a SequenceType can be: - "empty()" - an item type with an occurrence indicator; item types are: - "item()" - a node kind test, which are: - "node()" - a document node test, which can be: - "document()" - "document(element())" - "document(element(Name))" - "document(element(Name, *))" - "document(element(Name, Type))" - "document(element(*, Type))" - "document(element(SchemaPath))" - an element node test, which can be: - "element()" - "element(Name)" - "element(Name, *)" - "element(Name, Type)" - "element(*, Type)" - "element(SchemaPath)" - an attribute node test, which can be: - "attribute()" - "attribute(Name)" - "attribute(Name, *)" - "attribute(Name, Type)" - "attribute(*, Type)" - "attribute(SchemaPath)" - a processing instruction node test, which can be: - "processing-instruction()" - "processing-instruction(Name)" - "comment()" - "text()" - an atomic type, which can be any QName; common ones are: - "xdt:anyAtomicType" - "xs:string" - "xs:decimal" - "xs:double" - "xs:integer" - "xs:boolean" - "xs:date" - "xs:time" - "xs:dateTime" - "xdt:dayTimeDuration" - "xdt:yearMonthDuration" For a full list of the built-in atomic data types, look in the F&O spec at: http://www.w3.org/TR/xpath-functions/#datatypes and: http://www.w3.org/TR/xpath-functions/#duration-subtypes As I said, these atomic data types can be augmented with ones that you define yourself, within a schema, so it's not possible to generate an exhaustive list. > Yes, you're probably right Jeni... but I'm not surprised, > its got to be closer to xsl-fo complexity than xslt 1? There's certainly more to learn in XSLT 2.0 than there was in XSLT 1.0, which isn't surprising considering that it can do that much more. Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/ XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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