Generally, a genealogical DNA test might use either autosomal STRs or autosomal SNPs. (STR's are Short Tandem Repeats; SNPs are single-nucleotide polymorphisms.) However, testing companies do not currently offer autosomal STRs tests that use enough STR markers for genealogy.
The schema is the Active Directory component that defines all the objects and attributes that the directory service uses to store data. The physical structure of the schema consists of the object definitions. The schema itself is stored in the directory.
LDAP is a protocol specification for directory data. Active Directory is Microsoft's Implementation of an LDAP based directory server. AD also has custom extensions ontop of the LDAP v3 spec such as account lockout, password expiration, etc.nd this implementation is called Active Directory. So in a short summary, Active Directory is a directory services implemented by Microsoft, and it supports Lightweight Directory Access Protocol (LDAP). PS[0]: This answer heavily copies content from the wikipedia page listed above.