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Re: [ddlm-group] CIF-2 changes
- To: Nick.Spadaccini@uwa.edu.au, Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
- Subject: Re: [ddlm-group] CIF-2 changes
- From: David Brown <idbrown@mcmaster.ca>
- Date: Tue, 10 Nov 2009 09:53:31 -0500
- In-Reply-To: <C71F308B.123B7%nick@csse.uwa.edu.au>
- References: <C71F308B.123B7%nick@csse.uwa.edu.au>
Surely dREL is not compromised by what have been used as datanames
in the past. dREL apppears only in CIF2 dictionaries and uses only the
standard datanames that appear in the CIF2 dictionaries. The only
place where it is necessary to be concerned about [] and / appearing in
datanames is when reading in CIF1 data files. All the datanames that
appear in the CIF1 dictionaries are aliased in the CIF2 dictionaries.
This means that the the abilitiy to read datanames containing [] and /
is only required when reading in CIF1 data files, not when reading
dictionaries (the old datanames only appear in CIF2 dictionaries as
delimited values in the _alias loops). At the point where the CIF
value of _sint/lambda is read in, its internal name has in any case to
be equivalenced to the CIF2 dictionary name (_sintoverlambda) which is
data name used in the dREL stantements. Thus we are still free to
place any limitations we choose on the datanames used in dREL (except
for _ and . which, being punctuation, may cause problems with the names
used in programming languages). However, the CIF2 dictionaries also
define a _description.common dataname that contains only letters (and
numbers?) and these names could be used just as easily in dREL if that
were an advantage. David |
begin:vcard fn:I.David Brown n:Brown;I.David org:McMaster University;Brockhouse Institute for Materials Research adr:;;King St. W;Hamilton;Ontario;L8S 4M1;Canada email;internet:idbrown@mcmaster.ca title:Professor Emeritus tel;work:+905 525 9140 x 24710 tel;fax:+905 521 2773 version:2.1 end:vcard
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