- Design a straightforward query execution engine receives the simplified XQuery and an input XML file.
- Evaluate the query using a recursive evaluation routine which, given an XQuery expression (path, concatenation, element creation, etc) and a list of input nodes, produces a list of output nodes.
- Use ANTLR4 as XQuery Parser and dom4j as XML document parser.
- Optimize the query engine by detecting the fact that the FOR and WHERE clause computation can be implemented using the join operator.
- ANTLR4 output Java classes for each Xquery rule under
gen - Main query engine was written under
src