December 2014
Beginner
584 pages
15h 13m
English
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Chapter 6. XQuery for eXist
Most of your work using eXist will be done in the XQuery programming language. This chapter covers what is supported and what’s not. It will also describe some eXist XQuery specifics, like controlling the serialization and available pragmas.
eXist’s XQuery Implementation
Currently, 2.0+ versions of eXist support almost the full XQuery 1.0 specification (as eXist has done for years) and quite a lot of XQuery 3.0. This section will provide you with the details.
XQuery 1.0 Support
eXist implements almost the full XQuery 1.0 specification with the following exceptions:
eXist’s XQuery processor does not support the schema import and schema validation features, defined as optional in the XQuery specification (
validateandimport schema). The database does not store type information along with the (values of) nodes. It therefore cannot know the typed value of a node and has to assumexs:untypedAtomic. This is compliant with the behavior defined by the XQuery specification.You cannot specify a data type in an element or attribute test. The node test
element(test-node)is supported, but the testelement(test-node, xs:integer)will result in a syntax error.
Note
These missing features do not mean that eXist is not type safe; it is, very much so. It only means that type checking based on schema imports is not implemented.
eXist tested its implementation against the official XQuery Test Suite (XQTS version 1.0.2). From the more than 14,000 tests, it passed over 99%.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.