टेम्पलेट:Show data: रिवीजन सभ के बीचा में अंतर

A parameter being undefined or empty typically means the same. Something like "popinc=" from the preload can be left in the wikitext to be filled in later, while for parameters which are not applicable, such as ''country'' for a country, the parameter definition "country=" can besee deletedbelow. <code><nowiki>{{data ..|get ..}}</nowiki></code> gives the empty string and the text "<code><nowiki>{{{..}}}</nowiki></code>", respectively. Therefore an application checking the parameter has to check both. Checking whether a result is equal to e.g. the text "<code>{{{popinc}}}</code>" cannot be done directly with #ifeq in a template which itself has also a parameter with that name, because if that is defined, there would be a comparison with the value instead of the text itself. Instead, it can be checked whether the first character of the result is "<code>{</code>", e.g.: <code><nowiki>{{#ifeq:{{padleft:|1|{{data {{{continent}}}|get popinc}}}}|{|..|..}}</nowiki></code>.