Thanks Jeremy. Regards David On Monday, November 21, 2005, at 03:05 AM, Jeremy Wong Hiragino Kaku Gothic Pro黃泓量 wrote: David, I use the xml:lang attribute in my RDFResourceBundle class. I copy and paste one instance of it below as your reference. Jeremy Wong -- Miko-Kings Instruments Ltd. Web: http://www.miko.com.hk/ < < < < ]> < < <Software for Iwatsu DS-8812 (Beta version, Not for resales)< <Hiragino Kaku Gothic Pro岩通DS-8812軟件（試驗版，非賣品）< <岩通DS-8812のソフトウェア (開発版,ない販売のために)< < < <About Software for Iwatsu DS-8812< <關於岩通DS-8812軟件< <岩通DS-8812のソフトウェアのバージョン情報< < < <Version 1.0.0.6< <版本：1.0.0.6< <版：1.0.0.6< < < <Copyright (C) 2005 Miko-Kings Instruments Ltd.. All rights reserved.< <版權(C) 2005 力高儀器有限公司保留所有權利< <版權(C) 2005 力高儀器有限公司複製権所有< < < <Software Developer< <軟件開發者< <ソフトウェアの開発者< < < <OK< <確定< <OK< < < <Cancel< <取消< <キャンセル< < < ----- Original Message ----- From: "David Pratt" < To: "Semantic Web" < Sent: Monday, November 21, 2005 12:33 PM Subject: Four schema creation questions Hi. I have been working on a schema for a while. I think the biggest challenge is really distilling what I want to have in the schema and in my records and how explicit to be. I had started to put things into my triples store I had put together based on rdflb - but based on what I have so far but am realizing that there are some things that could likely be better. The organization of data could also be better by using bag, seq or alt which I am not using at this point. I had heard they were a bit difficult to work with so had initially stayed away from these structures. My questions follow: 1. Combining schemas: I have tried to create a schema that is pretty stand-alone (except for rdf namespaces) but there are some properties that are available in dublin core. Should I drop these properties in favor of dublin core and add its namespace or create a reference to dublin core, adding its namespace, since these properties are pretty much equivalent. What are my alternatives? 2. When to group I am hoping someone can offer constructive comment on when to group rdf data with bag / seq or alt. As an example, I am using an author property and it is significant that the primary author is listed first if there is more than one. It seems like a good candidate for a seq but often there is only a single author.. Another example is keywords. I don't think dublin core puts these in a bag for example but it would seem like a good use for a bag with list element. So the question is really when to use a bag and when to use a property on its own where it can exist as more than one instance in a record. 3. Use of Language attribute I am planning on having multilingual data but likely 80% of all data in the store will likely be in english. Almost all the rdf I have looked at thus far, I do not see very high use of language attributes in rdf. Maybe it is simply because english is used much of the time. Can someone provide a practical recommendation on use of language attribute. I was thinking I ought to be explicit with pretty much any literal that is unicode. 4. Datatype attribute I am looking for any recommendations based on experience with the datatype attribute. My intention is to be more (as opposed to less) specific about the type of data I will expect from the records since records will be validated before being inserted into the triples store. I have been looking at Sparta since it seems to try and match python data types with rdf types. Just looking for any kind of advise from anyone that has worked with a programming language and rdf types to offer any general recommendations based on their experience. Many thanks David