[xsl] Re: Select with multiple conditions?

["Eliot Kimber eliot.kimber@xxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Your 2nd and third constructions are not correct, in that they are not going
to do what you intend.

The second option uses | (set union) where you mean OR (logical OR), so you
are effectively creating a sequence of Booleans (although I think that isnt
really a thing in XPath 1, but Id have to review).

For the 3rd youre creating a sequence of one Boolean and three strings, which
will always evaluate to true, and again, may not even be meaningful in XPath
1.

My guess would be that your first option is the most efficient (besides being
the only correct one as written) because it presumably takes advantage of the
selection optimizations an XSLT engine uses for doing basic selection of
elements based on simple predicates like attribute value checks.

Cheers,

E.

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From: Michele R Combs mrrothen@xxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Wednesday, December 8, 2021 at 8:53 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Subject: [xsl] Select with multiple conditions?
[External Email]

All three of these constructions appear to be valid (this is xsl 1.0, sorry
for being antiquated!).  Will there be differences in the output?  If not, is
one option better than the others, and if so why?  Im guessing that there
are no differences in output, and that option 3 is better because more
concise.  Am I right?


or statements in the select condition:

<xsl:for-each select="child::*[@level = 'collection']  | child::*[@level =
'recordgrp']  | child::*[@level = 'series'] | child::*[@level =
'subseries']">

or statements inside the node description [ ]

<xsl:for-each select="child::*[@level = 'collection' | @level = 'recordgrp' |
@level = 'series' | @level = 'subseries']">

or statements inside the attribute match

<xsl:for-each select="child::*[@level = 'collection' | 'recordgrp' | 'series'
| 'subseries']">


Michele
+++++++++
Michele Combs | Lead Archivist
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