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.
Definition - What does Active Directory (AD) mean? Active Directory (AD) is a Windows OS directory service that facilitates working with interconnected, complex and different network resources in a unified manner. Active Directory was initially released with Windows 2000 Server and revised with additional features in Windows Server 2008.