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   Re: [xml-dev] <key> and <keyref> - predefined values for XML elements

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The predefined xml:lang attribute is designed specifically for the
language enumeration you mention. As for the country/currency codes, I'm
sure that someone from the OASIS UBL TC will soon provide insight into
how these are being handled within UBL.

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Strategy and Technology Consultants to the World

Markus Seibold wrote:
> Hello XML-DEV mailing list,
> I am developing a XML Schema which should function as the interface to a
> relational database. I first developed a ERM data model and am trying to derive
> the XML Schema from this ERM model right now.
> I came across the following problem:
> I want to insert, for example, a country in the database. Therefore, I
> declared an element <Country> in my main XML Schema. The country, among others,
> has a subelement <language> which represents the official language(s) of the
> country.
> How can I assure that the value(s) of language in an instance document can
> only be of specific predefined values?
> I already tried the following: I created another XML Schema which is
> included in my main Schema. The element <language> in the main schema is of
> type="LanguageID":
> <Another schema>
> <simpleType name="LanguageID">
> <restriction base="string">
> <enumeration value="DE"/>
> <enumeration value="EN"/>
> <enumeration value="FR"/>
> <enumeration value="SP"/>
> </restriction>
> </simpleType>
> </Another schema>
> But here comes my problem: There is a table in the relational database which
> stores both LanguageID and LanguageName (i.e., EN and English). The Country
> table is related with a m:n relationship to the Language table.
> What I actually want to achieve in my XML Schema is to model this
> relationship:
> Whenever I insert a country via an XML instance document I want to spedify
> the language(s) of this country by representing the foreign key relationship
> between the two database tables.
> What is the best approach for representing relationships to master data
> (such as languages, currency codes etc.) in XML?
> I though about using <key> and <keyref>. <keyref> can only point to XML
> element/attribute content in instance documents, right? So what I had to do is
> represent the Language database table as an own XML instance document, right?
> But how can I reference from instance documents based on my main XML Schema
> (which contain the <country> element) to another XML instance file (which
> contain the languages master data)? I read that XPath is not capable of this?
> Sorry for this massive email but I really have no experience with
> representing ERMs in XML Schema and need some help.
> Thanks a lot!
> Markus
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