[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Separate data from rules ... is the XML Schema 1.1 <assert
Regarding where to put the checking: 1. User Experience is always better if you let the user know immediately when they have broken a rule. So this requires a check to the rules engine and then a properly crafted User Experience response - like a good message and perhaps a pointer to some help. All this can be localized. 2. Your business logic level should reject invalid where your Business logic API does not explicitly enforce rules. 3. The database can have "structural" rules but the error messages may leave something to be desired and may not be localizable. -----Original Message----- From: Andrew Welch [mailto:andrew.j.welch@gmail.com] Sent: Wednesday, June 17, 2009 6:13 AM To: Michael Kay Cc: Costello, Roger L.; xml-dev@lists.xml.org Subject: Re: Separate data from rules ... is the XML Schema 1.1 <assert> element a step backwards? >> First an example of a business rule: >> >> A Level 1 manager has a maximum signature >> authority of $10K. >> >> >> An auto loan applicant, living in Ohio, is >> underage if he/she is under 18 years of age. >> >> If a customer has no outstanding invoices, >> then the customer is of preferred status. >> > > I agree those are business rules and are best kept out of a schema. > > What's more difficult are rules like "Every branch of the bank has a branch > manager" - that's on the borderline between structural rules and business > rules. I've often wondered where you draw the line - do you check everything possible in the xsd, or only in the application, or both. There doesn't seem to be a simple answer, but a rough guide is: if you don't want "branch manager" to ever be null, check it in the schema. If however, you want a nice error message instead of one mentioning "invalid content" and "complex type" then let it through to the app. -- Andrew Welch http://andrewjwelch.com Kernow: http://kernowforsaxon.sf.net/ _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@lists.xml.org subscribe: xml-dev-subscribe@lists.xml.org List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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