!!! Overview
[{$pagename}] 

The component equality matching rules have a variable assertion syntax.  
In [X.500] this is indicated by omitting the optional [SYNTAX] field in the [MATCHING-RULE|MatchingRule] information object.  The [assertion] syntax then defaults to the target attribute's syntax in actual usage, unless the description of the matching rule says otherwise.  

The  SYNTAX field in the [LDAP]-specific encoding of a MatchingRuleDescription is mandatory, so the [{$pagename}] syntax is defined to fill the same role.  That is, the [{$pagename}]  syntax is semantically equivalent to an omitted [SYNTAX] field in an [X.500] MATCHING-RULE information object.  

[{$pagename}] [MUST NOT] be used as the [attribute] syntax in an [AttributeTypes] definition.

Unless explicitly varied by the description of a particular matching rule, if an [{$pagename}] [Assertion Value] appears in a [ComponentAssertion] its LDAP-specific encoding is described by the <Value> rule in GSER, otherwise its [LDAP]-specific encoding is the encoding defined for the syntax of the attribute type to which the matching rule with the [{$pagename}] [assertion] syntax is applied.


The LDAP definition for the [{$pagename}] syntax is:
* [OID]: [1.2.36.79672281.1.5.3] 
* DESC [{$pagename}]

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]