<html>
<head>
<title>AST</title>
</head>
<body>
<p>

This package contains an Abstract Syntax Tree which provides an intermediate translation
target for SPARQL parsers.  This makes it relatively easy to integrate different
SPARQL parsers with bigdata.  The resulting AST is translated into a bigdata
evaluation plan (bops) which is then executed on the query engine.

</p>

<pre>
QueryRoot extends GroupNodeBase implements IGroupNode
-Dataset
-Distinct
-Order by expressions
-Limit / offset

