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Re: [xsl] XSLT3 deep-equal() question

2020-03-27 12:35:07
The shallow-copy drops type annotations on element nodes, so there could be a 
false result if the input is typed (i.e. schema-validated). The effect of type 
annotations on deep-equal() is somewhat arcane (I have no recollection of how 
the rules were arrived at).

Apart from that I think you're guaranteed a true result. But I could be wrong!

I can't see why having external entities would make any difference.

Michael Kay

On 27 Mar 2020, at 16:43, Alan Painter 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

Hello XSLT Community,

I'm Using XSLT3 (Saxon 9.9 HE).

I'm wondering if it's reasonable to expect deep-equal() to always return true 
in the following scenario.  I suspect "yes" but wondering what corner cases 
that I might encounter.

We'll be pushing some data-oriented source documents, with no external 
entities, through templates which are all in a mode defined from 
"shallow-copy" similar to the below.

What I'm wondering under what conditions of source documents that the 
following stylesheet would return "false" rather than "true".  (Again, 
excluding external entities.) I'm hoping that the list of conditions is nil 
or very small.

Thanks for any help.


  <xsl:mode name="a" on-no-match="shallow-copy"/>

  <xsl:output method="text" />
  <xsl:template match="/" >
      <xsl:variable name="afterApply">
          <xsl:apply-templates select="/" mode="a"/>
      <xsl:sequence select="deep-equal(/, $afterApply) => string()" />

Alan Painter
Confined in France

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