[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Yet another plea for XUpdate (was New XSLT, XPath, and XQ
--- Patrick Lehti <Patrick.Lehti@i...> wrote: > IMHO, typing of updates does matter. It is even more > important, than > typing of queries itself, because > you are changing the state of your database! > Just think of an XML document of some GBs of size > and you want to change > a greater amount of nodes in that document with your > update query. Do > you really prefer a post-update validation of the > complete document > against a static type check of the update query? > Don't forget: if the > validation fails, you have to do a very expensive > rollback on your > database! And what about developing the update > query, do you want to do > these post-update validation and rollback steps > until you completely > debugged the query and it is working as you > expected? > Actually, I don't expect something that expensive. What I would like is for post-update validation to be the the most that is required by a DML specification giving implementations leeway to do more aggresive validation if they can which I am sure many will (in a way that would probably mimic much of the XQuery type system without some of the more onerous obligations). A post-update validation would be the minimum requirements as opposed to the XQuery expensive static & dynamic type checking as the minimal requirements approach. Secondly, XQuery doesn't really have a type system because it uses W3C XML Schema which is a validation system. Thus many of the things the XQuery type system is supposed to catch can also be caught by an aggressive validator. Even then many W3C XML Schema issues still need to be handled by post-update validation since XQuery punts on them (e.g. identity constraints, user defined type hierarchies by restriction or extension, etc). So a W3C XML Schema aware DB that uses XQuery still needs to support post-update validation to be fully compliant. PS: Weird, I didnt get this email at my work address even though it went out to XML-DEV. DISCLAIMER: This is my personal opinion and does not reflect the views, intentions, plans, or strategies of my employer. ===== THINGS TO DO IF I BECOME AN EVIL OVERLORD #93 If I decide to hold a double execution of the hero and an underling who failed or betrayed me, I will see to it that the hero is scheduled to go first. __________________________________________________ Do You Yahoo!? Yahoo! Health - your guide to health and wellness http://health.yahoo.com
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