An update from Baris Kazar of the Spatial development team:
We are happy to announce that Oracle Spatial and Graph for 12c Release 1 is now fully compliant with OGC's WFS 1.1.0 and WFS-T 1.1.0 standards.
For more information on Oracle Spatial and Graph standards compliance
http://www.opengeospatial.org/resource/products/compliant#Oracle_USA - full list of OGC standards compliance for all Oracle Spatial product versions
http://www.oracle.com/technetwork/database/options/spatialandgraph/documentation/spatial-stds-support-094078.html - Oracle Spatial Technologies Standards Page