The @scope attribute

The @scope attribute identifies the closeness of the relationship between the current document and the target resource.

If no value is specified, but the attribute is specified on an ancestor within a map or within the related-links section, the value will cascade from the closest ancestor. The processing default is determined by the value of the @href attribute. In most cases, the processing default is "local". However the processing default is "external" whenever the absolute URI in the @href attribute begins with one of the following schemes:

Processors can consider additional URI schemes as "external" by default. Processors MUST always consider relative URIs as "local" by default.

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