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Re: [ddlm-group] Finalizing DDLm
- To: Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
- Subject: Re: [ddlm-group] Finalizing DDLm
- From: David Brown <idbrown@mcmaster.ca>
- Date: Tue, 30 Mar 2010 11:59:41 -0400
- In-Reply-To: <279aad2a1003292316g38921bdftf8b76cdfc6410ae7@mail.gmail.com>
- References: <279aad2a1003242044k36ad7d0cgcc6200d35ed5634f@mail.gmail.com> <C7D104FC.13080%nick@csse.uwa.edu.au><279aad2a1003292316g38921bdftf8b76cdfc6410ae7@mail.gmail.com>
James seems to have summarized matters pretty well. The
implication is that a list category must be the end of the line - it
cannot have a subcategory. My real questions was whether a list
category must explicitly included as a loop, or whether the loop
structure is unnecessary if it only contained a single row. It is easy
enough to be safe by always inculding the loop, and I will probably
arrange to do this in the dictionaries. There are likely to be several
places with single fow loops appear, e.g., in examples or aliases. David James Hester wrote: Thanks Nick for clarifying this. We then return to David's question. If we assume that a 'Set' category cannot be a child of a 'List' category (I hope this is written down somewhere if it is the case) then my originally proposed solution would be impossible. Therefore, what David should do is to put the invariant items into a *parent* 'Set' category and state that the child 'List' category. That would solve the immediate issue of separating out looped and unlooped datanames. If some convenience is desired for dREL processing, the child 'List' category could be made joinable to that parent category, thereby making both invariant and looped items available in shorthand form by looping over the parent category. Of course, even if the child 'List' category is not explicitly joined to the parent 'Set' category, the parent category can be explicitly referenced in any dREL method using the full dataname. |
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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