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Test if
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#IF parser function
{{#show:Albania/OER| ?Has capital|link=none}} yields Tirana
{{#show:Hungary | ?In OECD}} yields "true"
{{#show:Brazil| ?In OECD}} yields ""
{{#if:string | yes | no}} yields "yes"
{{#if:{{#show:Brazil| ?In OECD}}| yes | no}} yields "no"
{{#if:{{#show:France| ?In OECD}}| yes | no}} yields "yes"
Thus:
{{#if:{{#show:Brazil| ?In OECD}}|Category:OECD|}} yields ""
{{#if:{{#show:France| ?In OECD}}|Category:OECD|}} yields "Category:OECD"
Thus:
[[{{#if:{{#show:France| ?In OECD}}|:Category:OECD|}}]] yields "[[
- Category:OECD]]"
But the [[ ]] codes do not make it a valid category definition.
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