Inevitably there are a number of minor ways in which is not an accurate implementation of . This section outlines these differences. The 0.98 version is taken as the main version.
The whole of Level 0 is implemented. Much of Level 1 is also running. The library modules (section 5 of 0.69) are much more patchy.
A major area of incompatability is in the conditions, some of which are not used when the document says they should. This is being improved daily6