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.
Object Naming. Active Directory is an LDAP-compliant directory service, which means that all access to directory objects occurs through LDAP. LDAP requires that names of directory objects be formed according to RFC 1779 and RFC 2247, which define the standard for object names in an LDAP directory service.