implied element

<implied element="element" property="attribute name" type="type"/>

Specifies an implied type. For example, the “alt” attribute on an object is usually a list, so to save having to specify the type each time we can use this:

 <implied element="object" property="alt" type="list">

This means we can specify an alt attribute without specifying the type:

 <alt>telly; television</alt>

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