Subject: Re: [xsl] Re: Seek an XPath expression which concatenates an arbitrary number of strings From: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 15 Mar 2024 16:18:24 -0000 |
On 15/03/2024 17:11, Roger L Costello costello@xxxxxxxxx wrote: > Hi Folks, > > Thank you for your replies. The string-join solution works fine. > > But, but, but, ... > > Why doesn't my XPath work: concat(for $i in //binary-value return $i) > > I thought that I was simply employing XPath's "composable language" capability. > > The XPath specification says this: > > XPath is a composable language > > What does that mean? > > It means that every operator and language construct allows any XPath expression to appear as its operand. > > So, what that means to me is that I can call the concat function: > > concat(...) The concat function is not defined as taking a sequence of values, instead its definition in https://www.w3.org/TR/xpath-functions-31/#func-concat says The fn:concat function is specified to allow two or more arguments, which are concatenated together. This is the only function specified in this document that allows a variable number of arguments. This capability is retained for compatibility with [XML Path Language (XPath) Version 1.0]. Contrast that with string-join taking a sequence i.e. https://www.w3.org/TR/xpath-functions-31/#func-string-join declaring fn:string-join($arg1 as xs:anyAtomicType*) as xs:string fn:string-join($arg1 as xs:anyAtomicType*, $arg2 as xs:string) as xs:string
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