Task 4. Implement XQuery 3.0 Update Facility

[gabriele-tomassetti]

Task 4. Implement XQuery 3.0 Update Facility

Description:

We implemented XQUF (XQuery Update Facility) 3.0 (task 4).

We Implemented new or changed declarations (Revalidation declaration/mode, new annotations for function and variable declaration). We have reviewed and completed small syntactic changes to existing expressions.
We implemented the new expressions:

• Copy Modify expression and Transform With expression
• Dynamic updating function call
• Insert, Delete, Replace and Rename expressions

Notice that the reference mentions 8 new kinds of expressions, but we counted 7. We assume that replace counts as double, since it can replace a node or a value of a node.

To accomplish this task we added several new classes and fields to existing classes.

There were similar constructs for Insert, Delete, Replace and Rename expressions related to the XQuery Update Extension. Looking at the documentation of that feature and XQUF we observed important semantic differences. I.e., one is designed to update persisting documents and ignores temporary documents, the other one behaves differently). So we created new skeleton Java classes to support these expressions parsed by the ANTLR grammars, instead of re-using the similar classes already present.

Reference:

XQuery Update Facility 3.0

Type of tests:

We implemented a few tests to verify that the updated parser creates the corresponding AST nodes for the examples.