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RE: OT: Where did URI pipe symbol hack originate?

• To: xml-dev@l...
• Subject: RE: OT: Where did URI pipe symbol hack originate?
• From: Jeff Lowery <jlowery@s...>
• Date: Thu, 14 Nov 2002 15:11:48 -0800

Thanks Richard.  I just got done writting up the same conclusion.  It's nice
to see the same excerpts.

> -----Original Message-----
> From: Richard Tobin [mailto:richard@c...]
> Sent: Thursday, November 14, 2002 3:03 PM
> To: xml-dev@l...
> Subject: Re:  OT: Where did URI pipe symbol hack originate?
> 
> 
> >Hah!  We've got people looking at that same RFC and saying colons are
> >reserved!
> 
> Oh yes, they're reserved all right:
> 
>    reserved    = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
>                 "$" | ","
> 
> But "reserved" doesn't mean what you might guess:
> 
>    The "reserved" syntax class above refers to those 
> characters that are
>    allowed within a URI, but which may not be allowed within a
>    particular component of the generic URI syntax; they are used as
>    delimiters of the components described in Section 3.
> 
> And in the path part of the URI, they don't have any syntactic meaning
> so they're allowed:
> 
>    abs_path      = "/"  path_segments
> 
>    [...]
> 
>    path          = [ abs_path | opaque_part ]
>    path_segments = segment *( "/" segment )
>    segment       = *pchar *( ";" param )
>    param         = *pchar
> 
>    pchar         = unreserved | escaped |
>                    ":" | "@" | "&" | "=" | "+" | "$" | ","
> 
> On the other hand, you'll see that the production for rel_path makes
> the first segment special; you can't use
> 
>   C:/foo
> 
> as a relative URI, because it would be confused with a scheme 
> called "C".
> So you might want to escape colons when generating relative URIs.
> 
> -- Richard
> 
> 
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