Can I use SPARQL to insert, delete, or update RDF data?

The current, standardized version of SPARQL deals only with retrieving selected data from RDF graphs. There is no equivalent of the SQL INSERT, UPDATE, or DELETE statements. Most RDF-based applications handle new, changing, and stale data directly via the APIs provided by specific RDF storage systems. Alternatively, RDF data can exist virtually (i.e. created on-demand in response to a SPARQL query). Also, there are systems which create RDF data from other forms of markup, such as Wiki markup or the Atom Syndication Format.