Am 08.03.2018 um 07:36 schrieb Dr. Patrik Stellmann
patrik(_dot_)stellmann(_at_)gdv-dl(_dot_)de:
Hi,
a question more motivated by curiosity than by a real problem:
With
<xsl:sequence select=“a, b“/>
I will get first element a and second element b – no matter of the
order within the input document.
But with
<xsl:sequence select=“root/(a, b)“/>
I will get the elements a and b in document order. So this behaves
identical to
<xsl:sequence select=“root/(a | b)“/>
Why?
As for the why, see https://www.w3.org/TR/xpath20/#id-path-expressions
which says
Each operation|E1/E2|is evaluated as follows: Expression|E1|is
evaluated, and if the result is not a (possibly empty) sequence of
nodes, atype error <https://www.w3.org/TR/xpath20/#dt-type-error>is
raised [err:XPTY0019 <https://www.w3.org/TR/xpath20/#ERRXPTY0019>]. Each
node resulting from the evaluation of|E1|then serves in turn to provide
an*inner focus*for an evaluation of|E2|, as described in*2.1.2 Dynamic
Context* <https://www.w3.org/TR/xpath20/#eval_context>. The sequences
resulting from all the evaluations of|E2|are combined as follows:
1.
If every evaluation of|E2|returns a (possibly empty) sequence of
nodes, these sequences are combined, and duplicate nodes are
eliminated based on node identity.The resulting node sequence is
returned indocument order
<https://www.w3.org/TR/xpath20/#dt-document-order>.
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