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I'm struggling to understand what keywords to google search to find information about a specific Wikipedia table:

This page contains three tables. https://wiki.openstreetmap.org/wiki/Key:cuisine#Food

This is the top one: https://wiki.openstreetmap.org/w/index.php?title=Template:Map_Features:Cuisine_(ethnicity)&action=edit

Typical row:

[[{{{american:value|{{LL|1=Tag:cuisine=american}}}}} | american]]
| {{{american:desc| Food originating from the United States. Use a more specific value if possible. }}}
| {{{american:wikipedia| {{wikipedia|en|American cuisine|text=no}} }}}
| {{{american:photo|[[File:Motherhood and apple pie.jpg|100px|center]]}}}

Please point me to the relevant pages to understand:

  • What 'LL' represents.
  • What '1=' is used for.
  • What is the purpose of the namespace labels, in this example"american:"

Are they Openstreetmap wiki specific? Do they relate only to wiki tables?

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LL is the name of a template, in this case referring to https://wiki.openstreetmap.org/wiki/Template:LL, which links to a given page in the correct language. This specific template is not a built-in MediaWiki feature, but many other MediaWiki wikis have templates with similar names and features.

1= is generic syntax that can be used on any MediaWiki wiki to explicitly specify that a parameter nam is numeric even if it contains an equals sign. {{LL|Tag:cuisine=american}} would pass american as a parameter named Tag:cuisine to the LL template, whereas {{LL|1=Tag:cuisine=american}} passes Tag:cuisine=american as the 1 parameter (equivalent to the first unnamed parameter) to the template. In sufficiently recent MediaWiki versions {{LL|Tag:cuisine{{=}}american}} also works.

{{{american:value|...}}} is a parameter name, defaulting to the above expression ({{LL|1=Tag:cuisine=american}}) if no american:value parameter is given, as is the case on https://wiki.openstreetmap.org/wiki/Key:cuisine#Food. Some other page could do {{Map Features:Cuisine (ethnicity)|american:value=...}} and override the given parameter, although it appears no pages on the wiki do. The use of a colon for namespacing is a wiki convention and ignored by the software itself, which treats american:value as an opaque string.

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