A keys attribute consists of one or more space-separated keys. Map authors define keys using a topicref or topicref specialization that contains the “keys” attribute. Each key definition introduces a global identifier for a resource referenced from a map. Keys resolve to the resources given as the href value on the key definition topicref element, to content contained within the key definition topicref element, or both.
A key may not resolve to sub-topic elements, although a keyref attribute may do so by combining a key with a sub-topic element id.
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OASIS DITA Version 1.2 -- OASIS Standard, 1 December 2010
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