August 2003
Intermediate to advanced
624 pages
15h 3m
English
Content preview from Using XML with Legacy Business ApplicationsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Keys and Uniqueness
Schema language offers four different mechanisms for relating Elements to each other. Several offer a means by which schema processors can enforce something similar to the referential integrity or unique key constraints that relational database systems offer. The four mechanisms are (1) ID with IDREF, (2) the xs:unique schema language Element, (3) xs:key and xs:keyref, and (4) XLink and XPointer. Any one of these would require at least a paragraph and an example to explain. That doesn't quite seem appropriate for a discussion about little-used features. To date, most people are content to let their applications enforce referential integrity and uniqueness and to relate different Elements in instance documents using the appropriate ...
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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.