Re: [xsl] XSLT 2.0 courses?
2020-09-20 20:34:03
Hi,
An avid user of ($a, $b)[1] myself, which winks at TransactSQL
ISNULL($a, $b) and MySQL IFNULL($a, $b), I do have to remind myself that
$a has to be a single item for the /if/else /shortcut to work.
So, in
let $a := ('one','two','three')
let $b := ('none')
return ($a, $b)[1] will return just the first item in the sequence,
'one', and not 'one','two','three', which might be what you want to
achieve in this quasi shorthanded /if/else /construction.
Not that you wouldn't know, Liam, just as a heads up to some others in
this audience who might not.
Best,
Pieter
On 19/09/2020 01:54, Liam R. E. Quin liam(_at_)fromoldbooks(_dot_)org wrote:
On Fri, 2020-09-18 at 19:31 +0000, Wendell Piez
wapiez(_at_)wendellpiez(_dot_)com
wrote:
Hi,
In addition to Liam's list I think there are a couple more vital
features
one needs to get a taste of in XSLT 2.0 or XSLT 3.0, if one has been
subsisting on an XSLT 1.0 diet:
* <xsl:for-each-group> and its uses
* temporary trees -
* regex support in functions and xsl:analyze-string
* tunnel parameters?
Yeah, those are all huge, although i think easier to learn than things
like ($a, 'none')[1], which are startling because XSLT 1 didn't have
sequences.
For those wondering, ($a, $b, $c, ...)[1] returns the first non-empty
non-false item out of $a, $b and $c, so it's a shortcut for
<xsl:sequence select="if ($a) then $a else $b" />
On regular expressions - it's huge, but it's also dangerous, as e.g.
replace(price div 100, '\.\d*$', '') is not a good way to write
math:floor().
An XSLT-3-from-scratch course could easily take a full week and be
woefully incomplete. Or totally overwhelming. Or both.
On the other hand, i try & include "don't be afraid of the specs" in
the courses i teach, and then not cover every detail. So maybe it's
possible.
Liam
--
Pieter Lamers
John Benjamins Publishing Company
Postal Address: P.O. Box 36224, 1020 ME AMSTERDAM, The Netherlands
Visiting Address: Klaprozenweg 75G, 1033 NN AMSTERDAM, The Netherlands
Warehouse: Kelvinstraat 11-13, 1446 TK PURMEREND, The Netherlands
tel: +31 20 630 4747
web: www.benjamins.com
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- Re: [xsl] XSLT 2.0 courses?, (continued)
- Re: [xsl] XSLT 2.0 courses?, sullivandt dsullivan(_at_)danal(_dot_)com
- Re: [xsl] XSLT 2.0 courses?, Dimitre Novatchev dnovatchev(_at_)gmail(_dot_)com
- Re: [xsl] XSLT 2.0 courses?, G. Ken Holman g(_dot_)ken(_dot_)holman(_at_)gmail(_dot_)com
- Re: [xsl] XSLT 2.0 courses?, BR Chrisman brchrisman(_at_)gmail(_dot_)com
- Re: [xsl] XSLT 2.0 courses?, Liam R. E. Quin liam(_at_)fromoldbooks(_dot_)org
- Re: [xsl] XSLT 2.0 courses?, Wendell Piez wapiez(_at_)wendellpiez(_dot_)com
- Re: [xsl] XSLT 2.0 courses?, Imsieke, Gerrit, le-tex gerrit(_dot_)imsieke(_at_)le-tex(_dot_)de
- Re: [xsl] XSLT 2.0 courses?, Michael Kay mike(_at_)saxonica(_dot_)com
- Re: [xsl] XSLT 2.0 courses?, Imsieke, Gerrit, le-tex gerrit(_dot_)imsieke(_at_)le-tex(_dot_)de
- Re: [xsl] XSLT 2.0 courses?, Michael Kay mike(_at_)saxonica(_dot_)com
- Re: [xsl] XSLT 2.0 courses?, Imsieke, Gerrit, le-tex gerrit(_dot_)imsieke(_at_)le-tex(_dot_)de
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