[XML-SIG] prepare_input_source and relative path
Uche.Ogbuji at fourthought.com
Mon Feb 7 18:04:34 CET 2005
On Mon, 2005-02-07 at 12:18 +0100, Sylvain Thénault wrote:
> I've been heating a bug which is already registered as #616431 in the
> bug tracker. I find it very annoying and I've patched the function to
> make it work before noticing a patch was already available. Is there any
> reason to still wait to apply it ?
> Anyway I've joined to this mail my version of the fix, which fix the
> following cases:
> - prepare_input_source('relative.xml', '/base') -> /base/relative.xml
> the sf submitted patch fix this one to.
> - prepare_input_source('file:relative.xml', '/base') ->
> this allow to have a xml file containing relative system identifiers
> such as:
> <!ENTITY plans SYSTEM "file:plans.xml">
> <!ENTITY chatbot SYSTEM "chatbot.xml">
> where parse(open('path to my xml file')) should not fail as it currently
> If this patch sounds good to you, I can check it in.
Wow. I'm always amazed at some of bugs that have lived on for so long
Your patch seems fine to me, but there is one area that is probably
worth discussion. I hope Mike Brown has a moment to chip in because
he's an expert at such matters.
For the case of the file: URL scheme (BTW, you might want to consider
replacing your variable name "proto" with "scheme"), it's probably OK to
file:///base + file:relative.xml -> file:///base/relative.xml
Since the file scheme's semantics are so wooly. But this wouldn't make
sense if you replaced "file" with "http".
Then there's the matter of a base URI given as
in 4Suite we require all base URIs to be proper base URIs (so they must
at least have a scheme). I think this is a reasonable restriction based
on RFC requirements. Is there a valid user case where there would not
be a proper base URI, anyway?
Uche Ogbuji Fourthought, Inc.
http://uche.ogbuji.net http://4Suite.org http://fourthought.com
Use CSS to display XML - http://www.ibm.com/developerworks/edu/x-dw-x-xmlcss-i.html
Introducing the Amara XML Toolkit - http://www.xml.com/pub/a/2005/01/19/amara.html
Be humble, not imperial (in design) - http://www.adtmag.com/article.asp?id=10286
Querying WordNet as XML - http://www.ibm.com/developerworks/xml/library/x-think29.html
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