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The solutation for <tags> with template params is using of the {{#tag:}} parser function (the same for indicator or ref or references or ...)

Use {{#tag:indicator|name={{{id|}}}|[[File:Foo.svg|20px]]}}

(In reply to Umherirrender from comment #1)
> The solutation for <tags> with template params is using of the {{#tag:}}
> parser function (the same for indicator or ref or references or ...)
> 
> Use {{#tag:indicator|name={{{id|}}}|[[File:Foo.svg|20px]]}}

{{#tag:}} error:

Error: Page status indicators' name attribute must not be empty.

see https://en.wikipedia.org/wiki/User:Shizhao/sandbox

source: 
{{#tag:indicator|name=foooo|[[File:cscr-featured.svg|20px]]}}

The parameters need to be provided in this order:

{{#tag:indicator|[[File:cscr-featured.svg|20px]]|name=foooo}}

(In reply to Bartosz Dziewoński from comment #3)
> The parameters need to be provided in this order:
> 
> {{#tag:indicator|[[File:cscr-featured.svg|20px]]|name=foooo}}

thx. I see

The <indicator name="{{{id|}}}">[[File:Foo.svg|20px]]</indicator> syntax probably will not be supported: as far as I know no other tags support arbitrary wikitext in attributes and I wouldn't want to make this one different. I copied a few people who might have an opinion on this, anyone wants to say anything?

As was previously mentioned, just use #tag if you need this. I see no reason to make this tag special.

(In reply to Bartosz Dziewoński from comment #5)
> as far as I know no other tags support
> arbitrary wikitext in attributes and I wouldn't want to make this one
> different. 

Ah, interesting. I didn't know this. At one point, Gabriel and I had been fretting about templated attributes for extensions.

Parsoid already has some support for this, but we won't bother continuing to test and work on this.

Ex: https://gerrit.wikimedia.org/r/#/c/65575/ is an abandoned attempt. 

There are some FIXMEs in the code about the gaps which we'll remove and explicitly document that this feature doesn't need to be supported.