%META:TOPICPARENT{name="VirtTipsAndTricksSPARQL11FeaturesExamplesCollection"}%


---+ Virtuoso SPARQL 1.1. CLEAR Usage Example 

---++What?
This guide contains Virtuoso SPARQL 1.1. CLEAR Usage Example which you can run against any SPARQL endpoint that supports SPARQL 1.1 and the ability to allow a verified user perform INSERT operations.

---++Why?
Simple way of clear graph data.

---++How?

Here is example showcasing Virtuoso's support for this functionality:

   1 Assume the following Raw Data Representation in Turtle:
<verbatim>
<#alice> <#name> "Alice", "Alice Foo", "A. Foo" .
<#alice> <#knows> <#bob>, <#carol> .
<#bob>   <#name> "Bob", "Bob Bar", "B. Bar" .
<#carol> <#name> "Carol", "Carol Baz", "C. Baz" .
</verbatim>
   1 Beautified Raw Data Representation in Turtle (from above) using Namespace Prefix:
<verbatim>
<#alice> <#name> "Alice" . 
<#alice> <#name> "Alice Foo" . 
<#alice> <#name>  "A. Foo" . 
<#alice> <http://xmlns.com/foaf/0.1/knows> <#bob>, <#carol> . 
<#bob>   <#name> "Bob" . 
<#bob>   <#name> "Bob Bar" . 
<#bob>   <#name> "B. Bar" . 
<#carol> <#name> "Carol" . 
<#carol> <#name> "Carol Baz" . 
<#carol> <#name> "C. Baz" . 
</verbatim>
   1 Load the sample data:
<verbatim>
INSERT {
         GRAPH <urn:sparql:tests:clear> 
           {
             <#alice> <#name> "Alice" . 
             <#alice> <#name> "Alice Foo" . 
             <#alice> <#name> "A. Foo" . 
             <#alice> <http://xmlns.com/foaf/0.1/knows> <#bob>, <#carol> . 
             <#bob>   <#name> "Bob" . 
             <#bob>   <#name> "Bob Bar" . 
             <#bob>   <#name> "B. Bar" . 
             <#carol> <#name> "Carol" . 
             <#carol> <#name> "Carol Baz" . 
             <#carol> <#name> "C. Baz" . 
           }
       }
</verbatim>      
   1 Clear the inserted data:
<verbatim>
SPARQL CLEAR GRAPH <urn:sparql:tests:clear>;

Query result:
callret-0
ANY
 Clear graph <urn:sparql:tests:clear> -- done
No. of rows in result: 1 
</verbatim>

   
---++Related

   * [[http://www.w3.org/TR/2012/PR-sparql11-update-20121108/#clear][SPARQL 1.1 CLEAR]]
   * [[http://www.w3.org/TR/rdf-sparql-protocol/][SPARQL Protocol (HTTP based Query Service)]]  
   * [[VirtTipsAndTricksGuide][Virtuoso Tips and Tricks Collection]]
   * [[VirtTipsAndTricksSPARQL11FeaturesExamplesCollection][Virtuoso SPARQL 1.1 Usage Examples Collection]]
   * [[http://virtuoso.openlinksw.com/tutorials/sparql/SPARQL_Tutorials_Part_9/SPARQL_Tutorials_Part_9.html][Virtuoso SPARQL 1.1 Syntax Tutorial]]
   * [[http://docs.openlinksw.com/virtuoso/rdfsparql.html][Virtuoso Documentation]]