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This template packs structured data into a compact item, which can be passed as a parameter to another template. This allows to pass multiple structured items to that template, which can iterate over the items and extract data from them.
Usage
The structured data item contains all parameters (both numbered ones and named ones) passed to the {{Item}} template. For example, {{Item|Alice|Bob|best=Eve}} creates an item with components 1=Alice, 2=Bob, best=Eve.
Multiple items will be passed to an example recipient template {{User:Petr Matas/sandbox/Pets}} like this: 模板:Automarkup
Constructs available to recipient templates
Get a component of an item
See Template:Component.
Format an item using a template
See Template:Format item.
Format each item using a template
In the recipient template, use:
{{#invoke:Item|each|template=TransformationTemplate|Separator|Prefix|Suffix|...}}
This transforms all items using a given template. TransformationTemplate is called for each item with the parameters that the item has been created with, plus any additional parameters passed to #invoke (see {{Format item}} for details). The transformed items are separated with Separator and surrounded with Prefix and Suffix (whitespace is not stripped from these three optional parameters).
The template {{User:Petr Matas/sandbox/Pets}} from the example produces the list of pets using the following code (note the use of newline as a Separator and * as a Prefix to produce list items):
{{#invoke:Item|each|template=Show pet|
|*}}
Gather given parameter from all items
In the recipient template, use {{#invoke:Item|gather|parameter=ParameterName|template=TransformationTemplate}} to gather the given parameter from all items. TransformationTemplate will be called once and the gathered parameters (one parameter from each item) will be passed to it.
The template {{User:Petr Matas/sandbox/Pets}} from the example produces the total number of legs using {{#invoke:Item|gather|parameter=legs|template=Sum}}.
See also
{{For loop}}