[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Namespaces !
<xml:hi/> I read the last specification of the XML Namespaces this night. To tell the truth it disturbed me somewhat ! * Namespace Constraint: Prefix Declared The WD says: "The namespace prefix, unless it is xml or xmlns, must have been declared in a namespace declaration. The namespace prefixes xml and xmlns are reserved, and considered to have been implicitly declared." 1/ The example following this definition uses a NS declared after its use : "<html:html xmlns:html='http://www.w3.org/TR/REC-html40'>" I am not sure that attribute-based is the best way for declaring NS. Why not have preserved the old specification for the declarations of XML Namespaces (using PI) ? And use something like : <?xml:namespace ns="http://www.w3.org/TR/REC-html40" prefix="html"?> <html:html xml:ns='html'> ... </html:html> Create another reserved name (xmlns) weighs down the XML notation and opens the door to already encountered problems (remenber HTML!). Each one (Microsoft, Netscape, Sun, ...) will arrive with its own reserved name and one will fall down in the same problems as with HTML (<OBJECT> vs <EMBED> for example). We should have only one reserved name : "xml" !!! 2/ There is a redundancy of information. A simple prefix is enough to specify the namespace used : <book xmlns='urn:loc.gov:books' xmlns:isbn='urn:ISBN:0-395-36341-6'> <title>Cheaper by the Dozen</title> <isbn:number>1568491379</isbn:number> ... Should be : <book xml:ns="books"> <!-- the default NS is "books" --> <title>Cheaper by the Dozen</title> <!-- switch to "isbn" NS --> <isbn:number>1568491379</isbn:number> ... This makes also XML document not easily readable. 3/ Implementation. If i understand the new WD, it's possible to have everywhere within the document (in each Element start tag) a Namespace declaration. Hum, i agree with James Clark that it is easy to implement but we have to provide for each Element object an 'xmlns' attribute and make inherited each one of its descendants. Pat. -- ============================================================== bonhomme@l... | Office : B.228 http://www.loria.fr/~bonhomme | Phone : 03 83 59 30 52 -------------------------------------------------------------- * Serveur Silfide : http://www.loria.fr/projets/Silfide * Projet Aquarelle : http://aqua.inria.fr ============================================================== xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|