Template:Data

Utility template that extracts a field from a data page.

Template parameters

Parameter		Description	Type	Status
Page name	1	Name of the data page to extract the data from. Example visit_url	Page	required
Field name	2	Name of the field to extract from the source page Example function1.parameter1	Line	required
Default value	3	Default value if the page does not contain the given field, or the field is empty Example no_name	String	optional

This template is based on the Template:Data page.

What is a Data Page?

Suppose a page named "XYZ" contains the following wikitext:

<onlyinclude>{{{{{format|DefaultTemplate}}}
|param1=abc
|foo=bar
|some.property=some value
|empty_value=
|{{{1|}}}
}}</onlyinclude>

Any page that contains code like this is a _data page_. A data page cannot render itself, but instead feeds its parameters to a rendering template ("DefaultTemplate" in this example) which is responsible for rendering the page.

The Template:Data template can extract individual fields from a data page, like this:

Wiki markup	Result
{{data|XYZ|param1}}	abc
{{data|XYZ|foo}}	bar
{{data|XYZ|some.property}}	some value
{{data|XYZ|empty_value}}
{{data|XYZ|empty_value|default value}}	default value
{{data|XYZ|value that does not exist|default value}}	default value