Have you ever faced XML/XPath limitations? I bet you have. Mostly it's related to the string manipulations. Parsing, complex replacements, regular expressions, array transformations, I don't even start about math or anything else, that every modern language has out of the box. In the Oracle SOA world, you are moaning and pull Java Embedded Activity to the process, every time when you need something like that.
Sure you could use Java string operations in XSLT but it means you should create XSLT document for that matter. SOA 12c is a game changer. With the native JSON support, it brings you JavaScript.
The question "Can I use JavaScript with my XML data?" has the answer: " Yes, You can!".
