[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Best Practice: id-idref or external entities?
Hi Folks, What is your experience with using id-idref? Good experience? Bad experience? It seems to me that the id-idref pair has a lot of resemblances to GOTOs, which implies that it might be wise to avoid id-idref. An alternative to using id-idref is to use external entities. What is your experience with using external entities? Good experience? Bad experience? It seems to me that external entities have a lot of resemblances to macro expansion, which is used with good effect in assembly programming, which implies that it might be good to use external entities. Below are two examples: the first uses id-idref and the second uses external entities. Which approach do you prefer? Or perhaps there is another approach that you prefer? /Roger ---------------------------------------------- id-idref ---------------------------------------------- <Books> <Book> <Author idref="RB" /> <Title>Illusions: The Adventures of a Reluctant Messiah</Title> </Book> <Book> <Author idref="RF" /> <Title>All I Really Need to Know I Learned in Kindergarten</Title> </Book> <Book> <Author idref="RB" /> <Title>Jonathan Livingston Seagull</Title> </Book> <Authors> <Author id="RB">Richard Bach</Author> <Author id="RF">Fulghrum</Author> </Authors> </Books> ---------------------------------------------- external entities ---------------------------------------------- <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE Books [ <!ENTITY RichardBach SYSTEM "RichardBach.xml"> <!ENTITY RobertFulghrum SYSTEM "RobertFulghrum.xml"> ]> <?xml-stylesheet type="text/xsl" href="identity.xsl"?> <Books> <Book> &RichardBach; <Title>Illusions: The Adventures of a Reluctant Messiah</Title> </Book> <Book> &RobertFulghrum; <Title>All I Really Need to Know I Learned in Kindergarten</Title> </Book> <Book> &RichardBach; <Title>Jonathan Livingston Seagull</Title> </Book> </Books> ---------------------------------------------- RichardBach.xml ---------------------------------------------- <Author> <Name>Richard Bach</Name> </Author> ---------------------------------------------- RobertFulghrum.xml ---------------------------------------------- <Author> <Name>Robert Fulghrum</Name> </Author>
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