// Subentry has to to have a subtree specification.
if (this.subTreeSpec == null)
{
// There is none for some reason eg this could be
// old Draft based ldapSubEntry so create a dummy.
this.subTreeSpec = new RFC3672SubtreeSpecification(
DN.NULL_DN, null, -1, -1,
null, null, null);
}
// Determine if this subentry is collective attribute subentry.