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Subject: RE: [xri-editors] Proposed text for 2.2.5


Sorry that I had to miss the call. 

Looks generally OK. I have a bit of problem with 
"is not technically a legal XRI" part, however. 

To me, the intent is more like 
"is technically a legal XRI, but is strongly discouraged."  

Nat

> -----Original Message-----
> From: Dave McAlpin [mailto:dave.mcalpin@epokinc.com] 
> Sent: Friday, November 07, 2003 11:13 AM
> To: xri-editors@lists.oasis-open.org
> Subject: [xri-editors] Proposed text for 2.2.5
> 
> In today's editor's call, I volunteered to draft some text 
> that normatively allows spaces in input and presentation, 
> disallows them in the BNF and generally discouraging their 
> use. This is the same approach taken by IRI in section 3.1 
> and 6.1. Here's the proposed text.
> 
> Infrastructure accepting or presenting XRIs MAY deal with 
> printable characters in the "excluded" set above, escaping 
> them on input and/or unescaping them prior to presentation. A 
> string that contains these characters in an unescaped form, 
> however, is not technically a legal XRI.
> 
> Note that presenting the "space" character in unescaped form 
> is especially risky for several reasons. First, it is 
> difficult to visually determine the number of spaces in a 
> string. An identifier that contains a run of several 
> unescaped spaces would be very prone to misinterpretation and 
> transcription errors. Second, the space character is often 
> used to delimit an XRI, so including unescaped spaces in a 
> string makes it difficult, and sometimes impossible, to 
> determine where the identifier ends. Finally, unescaped 
> spaces can be used to maliciously construct subtly different 
> identifiers intended to mislead the reader. For these 
> reasons, unescaped spaces SHOULD be avoided in presentation.
> 
> 
> 
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