Re: [xsl] type error on 3rd argument of key function

[Martin Honnen <Martin.Honnen@xxxxxx>]

Ihe Onwuka wrote:
>   <xsl:variable name="formats" as="element()+">
>          <lookup:format from="eps" to="image"/>
>          <lookup:format from="gif" to="image"/>
>          <lookup:format from="jpg" to="image"/>
> </xsl:variable>
>
> Assuming the above is correctly typed and I have the following key declaration
>
> <xsl:key name="formats" match="lookup:*/@to" use="../@from"/>
>
> Then the following invocation fais
>
> key('formats',xfile/@format,$
> formats)
>
> with the error
>
> A sequence of more than one item is not allowed as the third argument
> of key().......
>
> But if I untype the $format variable (remove the as attribute from the
> $format variable), it works.
>
> Experienced this on Saxon 9.1.0,7 and 9.3.0.5.

You could use
  as="document-node()"
if you want to use an "as" attribute to type annotate the variable.

I don't think keys work with sequences, you need a root node.