XQuery 3.0: An XML Query Language – W3C Candidate Recommendation
Abstract:
XML is a versatile markup language, capable of labeling the information content of diverse data sources including structured and semi-structured documents, relational databases, and object repositories. A query language that uses the structure of XML intelligently can express queries across all these kinds of data, whether physically stored in XML or viewed as XML via middleware. This specification describes a query language called XQuery, which is designed to be broadly applicable across many types of XML data sources.
Just starting to read the XQuery CR but the thought occurred to me that it could be a basis for a “subject identity equivalence language.”
Rather than duplicating the work on expressions, paths, data types, operators, expressions, etc., why not take all that as given?
Suffice it to define a “subject equivalence function,” the variables of which are XQuery statements that identify values (or value expressions) as required, optional or forbidden and the definition of the results of the function.
Reusing a well-tested query language seems preferable to writing an entirely new one from scratch.
Suggestions?
I first saw this in a tweet by Michael Kay.