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Subject: Re: [uima] Type System Base Model v.4
- From: Adam Lally <alally@us.ibm.com>
- To: Karin Verspoor <verspoor@lanl.gov>
- Date: Mon, 2 Apr 2007 12:12:25 -0400
Karin,
Overall looks good. I have a comment
about the TextAnnotation and TextRegionalReference definintion.
There are some tricky details regarding
a standard definition of beginChar, endChar. What exactly do these
values represent - Unicode character offsets? Note that Apache UIMA
does not use Unicode character offsets, but rather "UTF-16 code unit"
offsets - that is, each element is a 16-bit value like a char in a Java
String. This has the advantage of allowing constant-time indexing
(e.g. for getCoveredTex). Unfortunately not all Unicode characters
can be represented in 16 bits, so sometimes a single Unicode character
is split across two 16 bit values. Apache UIMA doesn't use true Unicode
character offsets in that cases. This is especially inconvenient
for anyone using UTF-8 rather than UTF-16 (for example, Perl annotators).
I'm not sure what the right answer it,
but using "real" Unicode character offsets seems like it's a
more appropriate use of the Unicode standard. Then, for Apache UIMA
to be compliant does it just need to accept XMI CASes with Unicode offsets
and covert them to its own internal representation? Or would the
internal representation have to actually change (which would be ugly).
Regards,
-Adam
_____________________________
Adam Lally
Advisory Software Engineer
UIMA Framework Lead Developer
IBM T.J. Watson Research Center
Hawthorne, NY, 10532
Tel: 914-784-7706, T/L: 863-7706
alally@us.ibm.com
Karin Verspoor <verspoor@lanl.gov>
03/30/2007 01:50 PM
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| [uima] Type System Base Model v.4 |
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Please find attached the reviewed document outlining
changes/proposals/action plan for the Type System Base Model.
Comments welcome.
Karin
_______________________________________________________________
Karin Verspoor, Computational Linguist
Knowledge and Information Systems Science team
Computer, Computation & Statistics division
http://public.lanl.gov/verspoor
email: verspoor@lanl.gov Mail: Los Alamos National Laboratory
phone: 505-667-5086 PO
Box 1663, MS B256
fax: 505-667-1126 Los
Alamos, NM 87545
_______________________________________________________________
[attachment "TypeSystemBaseModel_v4.doc" deleted by Adam Lally/Watson/IBM]
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