w3cGH-12 w3cGH-13 added introduction paragraph

index.html

@@ -562,8 +562,9 @@ <h2>Evaluation Semantics</h2>
     <section>
       <h2>Query Result Formats</h2>
 
-      <p>TODO: brief introduction paragraph (including a note that result of a CONSTRUCT query or a DESCRIBE query can be serialized using <a href="#turtle-star">Turtle*</a>)</p>
-
+      <p>In SPARQL, queries can take four forms: <em>SELECT</em>, <em>CONSTRUCT</em>, <em>DESCRIBE</em>, and <em>ASK</em>. [<a href="SPARQL11-QUERY#queryForms">SPARQL11-QUERY, Section 16</a>] The first of these returns its query solution as a set of variable bindings. The second and third both return an RDF graph, and the last returns a simple boolean value.
+      </p>
+      <p>The result of the <em>ASK</em> query form is not changed by the introduction of RDF*, and the result of the <em>CONSTRUCT</em> and <em>DESCRIBE</em> forms can be represented by<a href="#turtle-star">Turtle*</a>. However, since the <em>SELECT</em> form deals with returning RDF terms, the specific serialization formats for representing such query results need to be extended so that the new <a> embedded</a> triple RDF term can be represented. In this section, we propose extensions for the two most common formats for this purpose: [[[sparql11-results-json]]], and [[[rdf-sparql-XMLres]]].</p>
       <section>
         <h2>SPARQL* Query Results JSON Format</h2>
         <p>