Extend the subtreeSpecification syntax so that it allows an LDAP Filter (instead of)/(together with) a Refinement.
Current subtreeSpecification syntax is as follows:
SubtreeSpecification = "{" [ sp ss-base ]
[ sep sp ss-specificExclusions ]
[ sep sp ss-minimum ]
[ sep sp ss-maximum ]
[ sep sp ss-specificationFilter ]
sp "}"
ss-base = "base" msp LocalName
ss-specificExclusions = "specificExclusions" msp SpecificExclusions
ss-minimum = "minimum" msp BaseDistance
ss-maximum = "maximum" msp BaseDistance
ss-specificationFilter = "specificationFilter" msp Refinement
SpecificExclusions = "{" [ sp SpecificExclusion
*( "," sp SpecificExclusion ) ] sp "}"
SpecificExclusion = chopBefore / chopAfter
chopBefore = "chopBefore" ":" LocalName
chopAfter = "chopAfter" ":" LocalName
The new proposed syntax is as follows:
SubtreeSpecification = "{" [ sp ss-base ]
[ sep sp ss-specificExclusions ]
[ sep sp ss-minimum ]
[ sep sp ss-maximum ]
[ sep sp ss-specificationFilter ]
[ sep sp ss-ldapFilter ]; >>> The new element <<<
sp "}"
ss-base = "base" msp LocalName
ss-specificExclusions = "specificExclusions" msp SpecificExclusions
ss-minimum = "minimum" msp BaseDistance
ss-maximum = "maximum" msp BaseDistance
ss-specificationFilter = "specificationFilter" msp Refinement
ss-ldapFilter = "ldapFilter" msp LdapFilter; http://tools.ietf.org/html/rfc4515#section-3
SpecificExclusions = "{" [ sp SpecificExclusion
*( "," sp SpecificExclusion ) ] sp "}"
SpecificExclusion = chopBefore / chopAfter
chopBefore = "chopBefore" ":" LocalName
chopAfter = "chopAfter" ":" LocalName
Purpose of extending the syntax in this way is providing compatibility with existing subtree specifications.
The only thing that needs to be answered is what will happen if both specificationFilter and ldapFilter exist. We need to agree on a conflict resoution scheme here. For example we may just ignore specficationFilter if ldapFilter exists or we may try to "merge" both.