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

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

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"/>
>      </xsl:variable>
>
> 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

   as="item()*"

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.