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From "Conal Tuohy" <>
Subject RE: Version $Id$ style for xml files (Was: SVN behaviour with "Id" keyword)
Date Wed, 02 Feb 2005 03:42:02 GMT
Tim Larson wrote:

> On Wed, Feb 02, 2005 at 10:35:03AM +1300, Conal Tuohy wrote:
> > > Tim Larson wrote:
> > > > As part of my effort to keep whiteboard/forms mergeable,
> <snip/>
> > > >Could we pick a style, and then I will make the files I
> > > >happen to touch match it?
> > 
> > What about a processing instruction? 
> > <?version $Id$?>
> > 
> > This has the advantage over a comment that it can be 
> retrieved unambiguously with an XPath query: 
> > "processing-instruction('version')" 
> I like the ability to retrieve the Id info...not knowing
> much about processing instructions, will this produce
> valid processing instructions when the version control
> system expands $Id$?  This expands into lots of stuff:
> datestamp, filename, submitter, etc.

So long as it doesn't include the string "?>" it will be OK.

> Also, can this mess up any existing document processing?

It shouldn't. Most XML software should be happy to ignore processing instructions (unless
the pi is targeted at them), just like with comments. 

In the SAX pipeline, the processing instructions are passed using a "processingInstruction"
method, so completely independently of startElement/endElement/characters/etc. Typically,
pipeline components will inherit a "processingInstruction" method from a superclass, which
will do nothing.



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