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[xsl] [XPath 3.0] Partial function application plus arity?

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Hi Folks,

In previous discussions we seen that these 3 XPath expressions produce the
same result:

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XPath #1
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concat('Section', ': ', 1)

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XPath #2
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let $concat3 := concat#3
return $concat3('Section', ': ', 1)

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XPath #3
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let $concat3 := concat(?,?,?)
return $concat3('Section', ': ', 1)

Now, I would like to provide concat() a value for the first argument and leave
undefined two arguments. So I tried this:

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XPath #4
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let $concat3 := concat#3('Section')
return $concat3(': ', 1)

But that generates this error:

    Required item type of target of dynamic
    function call is function(); supplied value
    has item type xs:string

What is that error message saying?

What is the correct way of expressing the desired XPath?

/Roger

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