An Example for Retrieving Constructed Attributes from Microsoft Active Directory can be done using the filter and a baseDN of "" for the rootDSE %prettify
(&(systemFlags:1.2.840.113556.1.4.803:=$FLAG_ATTR_IS_CONSTRUCTED)(ObjectClass=attributeSchema))
/%
This works as "4" is a System-Flag in the Schema Defintion that indicates the attribute is a Constructed Attribute.
The 1.2.840.113556.1.4.803 (aka LDAP_MATCHING_RULE_BIT_AND) ExtensibleMatch Rule to select those with bit "4" set.