Add 'fragment' functionality for reusing parts of SPARQL

[kevinpeterson]

Need to be able to allow for SPARQL fragments to be identified and reused:

<select id="myID" resultMap="myResultMap">
       SELECT ?s ?prefLabel ?type
       WHERE {
       <![CDATA[
       ?s a foaf:Person.
       ?s a ?type.
    {#myFragment}
       ]]>
       }
   </select>
<select id="myFragment">
<![CDATA[
?s rdfs:label {#name}.  ]]>
       }
   </select>

I would envision this being implemented similar to MyBatis SQL Fragments