Re: [xsl] Initial whitespace in PI from XSLT, main body

On 07.05.2022 23:14, Bauman, Syd s(_dot_)bauman(_at_)northeastern(_dot_)edu 
wrote:
> _Writing_
> But what if I try to /write/ a PI whose string value starts with one
> or more whitespace characters?
>
> First, we know the processor is *required* to write out one or more
> whitespace characters between the PITarget and the value string. I
> presume (without knowing for sure) that the processor is welcome to
> use whatever set of whitespace characters it wants to separate the
> PITarget from the rest when it serializes a PI. (I have never seen nor
> heard of a processor that uses anything other than a single space
> (U+0020) character, myself.) I further suspect that most processors
> would choose to not use any whitespace characters when serializing a
> PI that does not have a value string.
>
> But if I am explicitly giving the processor a string to use as the
> value of the PI that starts with space, I sort of expect that string,
> including the leading space, to appear in the output after whatever
> space the processor normally uses to separate a PITarget from a value
> string. And that is the behavior I get from xsltproc.[B]
> <https://bauman.zapto.org/~syd/temp/DSG/Initial_whitespace_in_PI_from_XSLT/Appendix_B_xsltproc_output.xml>
> But it is not the behavior I get from Saxon.[C]
> <https://bauman.zapto.org/~syd/temp/DSG/Initial_whitespace_in_PI_from_XSLT/Appendix_C_Saxon_output.xml>
>
> So is Saxon in error, or is xsltproc in error, or is the spec
> ambiguous and either behavior is OK, or something else?
The relevant XSLT 3 spec section is
https://www.w3.org/TR/xslt-30/#constructing-simple-content and clearly
says "6. In the case of|xsl:processing-instruction|
<https://www.w3.org/TR/xslt-30/#element-processing-instruction>, any
leading spaces in the resulting string are removed."
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