6. The system of claim 5 , wherein the expression tree normalizer comprises at least one of an expression tree pruner configured to remove a redundant first portion of the expression tree, and to remove a second portion of the expression tree that is not relevant to a data source to which the query is directed, an expression tree standardizer configured to modify a third portion of the expression tree into a canonical form, or a sub-expression evaluator configured to evaluate a sub-expression of the expression tree.
8. The system of claim 6 , wherein the translation validator is configured to indicate an error if at least one URI component is determined to not be a legal addition to the resource bound expression tree.