Oracle uses a WKT syntax slightly different than the standard one, documented there:
The main difference is that Oracle doesn't enclose the Bursa-Wolf parameters into a TOWGS84 element. Instead, the numbers are inserted straight into the DATUM element. Example:
This task is about making the WKT parser tolerant to the non-standard Oracle way to defines Bursa-Wolf parameters, if an only if a TOWGS84 element is not presents in the WKT.