• To: Michael Kay <michael.h.kay@n...>
• Subject: Re: What niche is XQuery targeting?
• From: Jonathan Robie <jonathan.robie@d...>
• Date: Thu, 02 Dec 2004 16:00:13 -0500
• Cc: 'Burak Emir' <Burak.Emir@e...>, 'David Carlisle' <davidc@n...>,'XML Developers List' <xml-dev@l...>
• In-reply-to: <20041202183550.SFKI3407.aamta07-winn.mailhost.ntl.com@Turtle>
• References: <20041202183550.SFKI3407.aamta07-winn.mailhost.ntl.com@Turtle>
• User-agent: Mozilla Thunderbird 0.9 (Windows/20041103)

Michael Kay wrote:

> You can argue that the equivalent syntax in XSLT is very cumbersome, but
> that only becomes a problem if you're doing heavy joins, and I very rarely
> see applications that need that: in XML 90% of the relationships tend to be
> within the hierarchy, so you use the XPath axes rather than value-based
> joins. 

Some common reasons I have seen for doing lots of joins: references 
among web pages (especially in mailing list archives!), ATOM or RSS 
feeds, joins among XML views of relational tables, correlation data from 
several hierarchies to create a different representation...

If every set of data had only one sensible hierarchical relationship, we 
wouldn't wind up doing so much joins and restructuring.

Jonathan

• References:
  • RE: What niche is XQuery targeting?
    • From: "Michael Kay" <michael.h.kay@n...>

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