Key terminology
Certain terminology is used to discuss keys.
- resource
 - For the purposes of keys and key resolution, one of the following:
- An object addressed by URI
 - Metadata specified on a resource, such as a 
@scopeor@formatattribute - Text or metadata located within a 
<topicmeta>element 
 - key
 - A name for a resource. See Using keys for addressing for more information.
 - key definition
 - A 
<topicref>element that binds one or more key names to zero or more resources. - key reference
 - An attribute that references a key, such as 
@keyrefor@conkeyref. - key space
 - A list of key definitions that are used to resolve key references.
 - effective key definition
 - The definition for a key within a key space that is used to resolve references to that key. A key might have multiple definitions within a key space, but only one of those definitions is effective.
 - key scope
 - A map or section of a map that defines its own key space and serves as the resolution context for its key references.