The @conkeyref attribute
The @conkeyref attribute provides an indirect content reference to
topic elements, map elements, or elements within maps or topics. It allows the referencing
element to use a key in place of a file name when referencing another topic or map.
When the target of a content reference is an element within a topic or map, the value of
the @conkeyref attribute is a key name, followed by a slash ("/"), followed
by the ID of the referenced element. The key name must be bound to the topic or map that
contains the referenced element.
When the target of a content reference is a topic or map, the value of the
@conkeyref attribute is a key name that directly resolves to that topic or
map.
When the key name specified by the @conkeyref attribute is not defined and
the element also specifies a @conref attribute, the @conref
attribute is used to determine the referenced element. If no @conref
attribute is specified there is no content reference relationship.
The @conrefend attribute, which defines the end of a conref range, cannot
include a key. Instead the map or topic element addressed by the key name component of the
@conkeyref is used in place of whatever map or topic element is addressed
by the @conrefend attribute. See Using conrefend together with conkeyref for more information and for examples of this
behavior.