XML Schema Datatypes

XSD defines standard datatypes for RDF literals.

Namespace: http://www.w3.org/2001/XMLSchema (prefix: xsd:)
Purpose: ensure typed values (strings, numbers, dates) are consistent. Like giving units to various types.
Key datatypes:
- xsd:string
- xsd:integer
- xsd:dateTime
Example:

bdr:Barack_Obama dbo:birthDate "1961-08-04"^^xsd:date

Links: Used in both RDFS and OWL when specifying property ranges.