Create a QueryBuilder class

[seporaitis]

Example code interface should be something like:

$query = QueryBuilder::newInstance()->construct($model)->where($whatToSelect)->build();
$model = $repository->query($query);

$query = QueryBuilder::newInstance()->insert($model)->graph($someUri)->build();
$repository->insert($query);

Discussion is needed about how to implement complex queries (queries inside queries, selection form multiple graphs, etc.).

[seporaitis]

This is related: https://github.com/Graphity/graphity-core/issues/9 in the sense that QueryBuilder should generate a SPIN model, that would be serialized to RDF/XML and transformed to SPARQL using XSLT.

[namedgraph]

http://openjena.org/wiki/ARQ/Manipulating_SPARQL_using_ARQ