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Re: Three ways to organize data

  • From: Thomas Passin <list1@tompassin.net>
  • To: xml-dev@lists.xml.org
  • Date: Mon, 20 Mar 2023 13:03:03 -0400

Re:  Three ways to organize data
On 3/20/2023 12:02 PM, Roger L Costello wrote:
... The third way is to use the ID-IDREF capability of XML.

<BooksAndWatches>
     <Book id="PLAI">
         <Title>Programming Languages Application and Interpretation</Title>
         <Date>2007</Date>
         <Author idref="SK">Shriram Krishnamurti</Author>
     </Book>
     <Watch id="TimexInd">
         <Brand>Timex</Brand>
         <Model>Indiglo</Model>
         <Power idref="Lit">Battery</Power>
     </Watch>
     <Author id="SK">
         <Name>Shriram Krishnamurti</Name>
         <Employer>Brown University</Employer>
     </Author>
     <Battery id="Lit">
         <Chemistry>Lithium</Chemistry>
         <Volts>3</Volts>
     </Battery>
</BooksAndWatches>
Not so different as the second way, really. id/idref can be thought of as Primary Key/Foreign Key pairs. And the four xml docs of the second way could all be brought into a single XML document as external entities. Or Way #2 could be transformed into Way #3 with an XSLT transformation.




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