Reserved Attribute: id
Description
For each element that has an id, it can be accessed later by an
idref tag or an
idref attribute, or included any time by an
include tag. There are some other tags and attributes which use the id reference to retrieve objects.
Attribute Values
The attribute value can be any unique name.
Additional Notes
The id value should be unique within an XML document, although such constraint is not enforced.
CookXml also caches the object referenced by the id, which still can be accessed after XML decoding is finished.