This template transforms a given item using a given template.

{{Format item | item = Item | template = TransformationTemplate | ... }}

TransformationTemplate is called with the parameters that the item has been created with, plus any additional parameters passed to {{Format item}}. Contents of the item take precedence over the additional parameters, unless the parameter name is prepended with important . If the parameter name collides with the parameters of {{Format item}} itself, prepend it with param . There is no need to combine param and important , though.

It is also possible to transform multiple items at once, but not with this template.

Markup Renders as
{{Format item
| item = {{Item|name=Tom|animal=cat}}
| template = Show pet
}}

Tom is a cat.

{{Format item
| item = {{Item|name=Tom|animal=cat}}
| template = Show pet
| legs = 4
}}

Tom is a cat with 4 legs.

{{Format item
| item = {{Item|name=Tom|animal=cat}}
| template = Show pet
| param legs = 4
}}

Tom is a cat with 4 legs.

{{Format item
| item = {{Item|name=Tom|animal=cat}}
| template = Show pet
| animal = dog
}}

Tom is a cat.

{{Format item
| item = {{Item|name=Tom|animal=cat}}
| template = Show pet
| important animal = dog
}}

Tom is a dog.