Rosetta Code:Village Pump/Adding transclusion plugin

Adding transclusion plugin
This is a particular discussion thread among many which consider Rosetta Code.

Summary

Creating a template page which will extract content from existing pages on the fly and present cross-cutting content. For example, a page of all examples in a particular language

Discussion

I think this is relevant to

1. Rosetta Code:Village Pump/Download Perl Code
2. Rosetta Code:Village Pump/Language template enhancements
3. Rosetta Code:Village Pump/SMW Examples by language and concept

but I'd like to wait until I have a working small example to add to those pages. --Mcint (talk) 08:04, 25 September 2015 (UTC)

MediaWiki:Transclusion has background information and favors one use case,

but it also mentions MediaWiki:Extension:Labeled_Section_Transclusion,

which has a particularly useful section in mw:Extension:Labeled_Section_Transclusion#Transclude_a_specific_section

It says the function can be called as follows:

{{#lsth:pagename|sectionX}}

I would like to call:

=={{header|OCaml}}==

from the Pythagorean triples page

not working:

{{#lsth:Pythagorean triples|OCaml}}

{{#lsth:Pythagorean triples|OCaml}}

nor does

{{#lsth:Pythagorean triples|{{header|OCaml}}}}

{{#lsth:Pythagorean triples|OCaml}}