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Recursion in XSLT by Martien van den Akker

Juergen Kress
PaaS & Middleware Partner Adoption
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Last week I helped someone on the Oracle community forums with transforming a comma separated string to a list of elements. He needed this to process each element in BPM Suite, but it is a use case that can come around in SOA Suite or even in Oracle Integration Cloud.
You would think that you could do something like a for-each and trimming the element from the variable.

Recursion

One typical thing with XSLT is that variables are immutable. That means that you can declare a variable and assign a value to it, but you cannot change it. So it is not possible to assign a new value to a variable based on a substring of that same variable.
To circumvent this, you should implement a template that conditionally calls itself until an end-condition is met. This is a typical algorithm called recursion. Recursion is a way of implementing a function that calls itself, for example to calculate the faculty of a number. Recursion can help circumventing the immutability of variables, because with every call to the function you can pass (a) calculated and thus different value(s) through the parameter(s).
I wrote about this earlier, but last week a co-worker asked a similar question, but just the other way around: transforming a list into a comma separated string. So, apparently it's time to write an article about it. Read the complete article here.

 

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