IPP> MOD - Loose length restrictions definitions for 'xxxWith Language'

IPP> MOD - Loose length restrictions definitions for 'xxxWith Language'

IPP> MOD - Loose length restrictions definitions for 'xxxWith Language'

McDonald, Ira imcdonald at sharplabs.com
Sun Jan 30 20:51:30 EST 2000


Hi Pete,

I agree with you that the second interpretation (that
the 'textWithoutLanguage' component is ALWAYS 1023 octets
and the language tag is ALWAYS [up to] an additional
63 octets) is correct and reasonable.

The first interpretation is unreasonably complex and has
no obvious benefit (especially since the IIG encourages all
implementations to silently convert all input attributes
of 'textWithoutLanguage' to 'textWithLanguage' for best
interoperability).

Cheers,
- Ira McDonald (consulting architect at Sharp Labs America)
  High North Inc

-----Original Message-----
From: Zehler, Peter [mailto:Peter.Zehler at usa.xerox.com]
Sent: Thursday, January 27, 2000 9:07 AM
To: IPP Discussion List (E-mail)
Cc: Carl-Uno Manros (E-mail)
Subject: IPP> MOD - Loose length restrictions definitions for
'xxxWithLanguage'


All,
I sent this email out earlier this month.  I received no comments.  I
propose that we adopt the second interpretation of the length restriction
issue and update the IIG accordingly.  Does this need to be discussed at the
next PWG meeting or teleconference?  There were issues raised by some people
from India that might also be discussed.
Pete

				Peter Zehler
				XEROX
				Xerox Architecture Center
				Email: Peter.Zehler at usa.xerox.com
				Voice:    (716) 265-8755
				FAX:      (716) 265-8792 
				US Mail: Peter Zehler
				        Xerox Corp.
				        800 Phillips Rd.
				        M/S 139-05A
				        Webster NY, 14580-9701


	-----Original Message-----
	From:	Zehler, Peter 
	Sent:	Thursday, January 06, 2000 12:54 PM
	To:	IPP Discussion List (E-mail)
	Subject:	MOD - Loose length restrictions definitions for
'xxxWithLanguage'


		All,

		I have had a few conversations in this area and can see that
the length specification for textWithLanguage and nameWithLanguage  is a
little loose.  The description below applies to name as well as text.

		One interpretation comes from first reading the definition
for 'text'.  
		"A text attribute is an attribute whose value is a sequence
of zero or more characters encoded in a maximum of 1023 ('MAX') octets. " 
		One interpretation is that the "super type" 'text' is
limited to 1023 octets.  Therefore, the total length of 'textWithLanguage'
is limited to 1023 octets.  The 'language' portion of 'textWithLanguage'  is
limited to 63 octets.  The result is that the length of the 'language'
portion of 'textWithLanguage' "eats away" at the length of the 'text'
portion.  The two error cases, with respect to length, are the length of
'language' exceeds 63 octets and the combined length of 'language' and
'text' exceeds 1023 octets.
		  
		Another interpretation is from the definition of
'textWithLanguage' itself.  The 'textWithLanguage' definition contains:
		"The 'textWithLanguage' attribute syntax is a compound
attribute syntax consisting of two parts: a 'textWithoutLanguage' part plus
an additional 'naturalLanguage' " 
		This verbiage together with the length definition of
'textWithoutLanguage of 1023 octets seems to imply a different conclusion.
The total length of an attribute value of type 'textWithLanguage' would be
1086.  (This ignores the lengths types and attribute name portions of the
encoding)  In this interpretation the 'language' portion does not "eat away"
at the length of the 'text' portion.  The resulting two error cases, with
respect to length, are the length of 'language' exceeds 63 octets and the
length of 'text' exceeds 1023 octets

		Which interpretation is correct?

		I favor the second interpretation since it simplifies the
transformation between the two forms of 'text'.

		The resolution should be clarified in the IIG and moved to
the MOD on the next iteration.

		Pete



				Peter Zehler
				XEROX
				Xerox Architecture Center
				Email: Peter.Zehler at usa.xerox.com
				Voice:    (716) 265-8755
				FAX:      (716) 265-8792 
				US Mail: Peter Zehler
				        Xerox Corp.
				        800 Phillips Rd.
				        M/S 139-05A
				        Webster NY, 14580-9701




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