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chris miszturSubject: xquery rule execution
Author: chris misztur
Date: 08 Aug 2013 08:44 AM
hello, I am putting together individual xq files and want to use them as conversion rules. Here is a rule module:

declare function r:execute($params as element(params)) as xs:string?
if (matches($params/p1/text(), "^[2-9]\d{2}-\d{3}-\d{4}$"))
then substring($params/p1/text(), 1, 3)
else ''

And here is the 'rule engine' module:

import module namespace getAreaCodeFromHyphenatedPhoneNumber = "http://rules/getAreaCodeFromHyphenatedPhoneNumber" at "rules/getAreaCodeFromHyphenatedPhoneNumber.xq";
(: etc :)

declare function r:executeRuleParams($rule-name as xs:string, $element-name as xs:string, $params as element(params)) as element()?
let $rule := element {$rule-name} {}

return typeswitch($rule)
case element(passThru)
return r:buildElement($element-name, $params/p1/text())

case element(getAreaCodeFromHyphenatedPhoneNumber)
return r:buildElement($element-name, getAreaCodeFromHyphenatedPhoneNumber:execute($params))

case element(getLocalPhoneNumberFromHyphenatedPhoneNumber)
return r:buildElement($element-name, getLocalPhoneNumberFromHyphenatedPhoneNumber:execute($params))

case element(getAreaCodeFromTenDigitPhoneNumber)
return r:buildElement($element-name, getAreaCodeFromTenDigitPhoneNumber:execute($params))

case element(getLocalPhoneNumberFromTenDigitPhoneNumber)
return r:buildElement($element-name, getLocalPhoneNumberFromTenDigitPhoneNumber:execute($params))

case element(createAddressLineAndSuppressCityStateZipAcrossFields)
return r:buildElement($element-name, createAddressLineAndSuppressCityStateZipAcrossFields:execute($params))

return r:buildElement($element-name, 'INVALID RULE')

is there a more dynamic way to build the rule engine? I know that eXist has a util: name space which allows you to dynamically import xq and evaluate them.


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