Re: [xsl] Seek ways to make my streaming XSLT code run faster (My streaming XSLT program has been running 12 hours and is only a quarter of the way to completion)

["Liam R. E. Quin liam@xxxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On Sat, 2025-08-09 at 23:00 +0000, Liam R. E. Quin
liam@xxxxxxxxxxxxxxxx wrote:
> On Sat, 2025-08-09 at 22:25 +0000, Roger L Costello
> costello@xxxxxxxxxx 
> >
> > I want to iterate over all 1900 identifiers and for each of them,
> > iterate over all 5 million records to see which records contain the
> > identifier. There is a loop within a loop:
> >
> > For each 1900 identifiers do
> > B B B  For each 5 million records do
> > B B B B B B B B  Check record against identifier
>
> Outside streaming, you could
> 	apply-templates select="/records/record"
> and then have a template
> B B B  match="VOR_identifier[ancestor::record[
> B B B B B  not(Airport_SID_Primary_Records)
> B B B  ]
>
> and then process the record in a different mode?

to be clear you can't do that in streaming mode. If the document is too
large and you need to stream, you could have a template to match
record, and take a grounded snapshot of it, and process that in a
different (non-streaming) mode.

Any time you start thinking in terms of loops i think itbs time to take
a step back, especially in streaming, and ask if you can use template
match expressions to do more of the work, and also whether you can work
back from the result a bit more.

>
> Otherwise yes, XQuery.
>

--
Liam Quin,B https://www.delightfulcomputing.com/
Available for XML/Document/Information Architecture/XSLT/
XSL/XQuery/Web/Text Processing/A11Y training, work & consulting.
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