Furthermore, if you put the assertion on a parent element, then by default the
XDM instance against which the assertion is run has all comment and PI nodes
stripped (on the theory that comments and PIs should not affect the validity of
a document).
<quote>
XSD 1.1 part 1 §3.13.4.1 clause 1.2: By default, comments and processing
instructions are excluded from the partial ·post-schema-validation infoset·,
but ·at user option· processors may retain comments and processing instructions
instead of excluding them.
Note: If comments and processing instructions are retained, the consequence
will be that assertions are able to test for their presence or absence and to
examine their contents.
</quote>
Saxon provides an option to retain comments and PIs for evaluating assertions
Michael Kay
Saxonica
On 2 Dec 2019, at 17:50, G. Ken Holman
g(_dot_)ken(_dot_)holman(_at_)gmail(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
The data model within which an assertion is evaluated is comprised only of
the element itself, not its siblings. You are looking at siblings.
Per the specification:
https://www.w3.org/TR/xmlschema11-1/#sec-cvc-assertion
I hope this helps.
. . . . . . Ken
At 2019-12-02 17:27 +0000, Costello, Roger L. costello(_at_)mitre(_dot_)org
wrote:
Hi Folks,
Below is a sample XHTML document. Immediately following the <style> element
is a comment. I want to ensure that the value in the comment starts with
this string:
[if gte mso 9]><xml>
Using Oxygen, I ran the following XPath query (the <head> element is the
context node):
*[local-name() eq 'style']/following-sibling::comment()[1]/starts-with(.,
'[if gte mso 9]><xml>')
The result of running the query is:
true()
Perfect!
Next, I put the query into an XML Schema 1.1 assert element:
<xs:assert test="*[local-name(.) eq
'style']/following-sibling::comment()[1]/starts-with(., '[if gte mso
9]><xml>')" />
When I validated the XHTML document against the XML Schema, I got this error:
Assertion evaluation ('*[local-name(.) eq
'style']/following-sibling::comment()[1]/starts-with(., '[if gte mso
9]><xml>')') for element 'head' on schema type 'headType' did not succeed.
Why does the XPath query work fine when run in Oxygen but fails when used in
an XSD 1.1 assert element? /Roger
Here's the XHTML document:
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