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Re: [xsl] Type of a variable containing values of mixed types

Subject: Re: [xsl] Type of a variable containing values of mixed types
From: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 13 Apr 2015 10:53:00 -0000

Jorge . chocolate.camera@xxxxxxxxx wrote:

How can I enforce that a variable contains a particular bunch of mixed
types? Say:

     <xsl:variable name="MY_VAR" as="b&">
         <xsl:value-of select="42"/>
         <xsl:value-of select="13"/>
         <xsl:value-of select="hello"/>

Is there a way to enforce, with the attribute `as`, that the variable
contains a series of integers and a string (or, even, particularly 2
integers and 1 string) or else have the transformation fail?

Inside your variable with xsl:value-of you construct text nodes, not numbers or strings. If you want to output an integer then use e.g.

<xsl:sequence select="42"/>

to construct a string literal use e.g.

<xsl:sequence select="'hello'"/>

As for the "as" attribute, you can use


to make sure you get a sequence of values and not a temporary tree.

I am not sure a union type would help to allow only integers and strings, but I am sure you can't specify that a sequence is made up of two integers followed by one string. You would need to define a complex type with a sequence of two elements of type xs:integer and a third element of type xs:string and then would need a schema-aware processor which Saxon HE not is. And it would no longer be a sequence of atomic types but rather a sequence of elements.

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