Arit Paul and Chris Hitte
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SQL is a subset of SIM
SIM has the added functionality of:
◦ Classes
◦ Subclasses
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Preserved existing SIM and SQL functionality
of ReL
Created jsimparser
Modified PyTuple.java to call jsimparser
Modified Python.g to pass concrete syntax
Created SIMVisitor
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Class.java
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EVA.java
EVAAttribute.java
DVA.java
DVAAttribute.java
Insert.java
◦ Assignment.java
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Modify.java
Retrieve.java
◦ AttributePath.java
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Created JSIMparser based on JSQLparser
JSIMparser:
◦ Accepts concrete syntax from PyTuple.java
◦ Stores parsed data in instances of our newly
defined classes
◦ Builds AST from the instances
 AST is visited by SIMVisitor
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Created SIMVisitor based on SIMHelper and
SQLVisitor
SIMVisitor:
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PyTuple passes the AST to SIMVisitor
Visits the nodes of the AST produced by JSIMparser
Pulls key data from these nodes
Builds an equivalent SPARQL statement
SPARQLDoer executes this statement
... In class visitor ...
EVA and DVA visitor call correct SPARQL
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Class
Subclass
Insert
Modify
Retrieve
Concrete Syntax from Python.g
SPARQL conversion
Result of retrieve