Mandatory

When you derive from a KcsXform class, the mandatory external entry points are:

extern long KcsDLOpenXfrmCount; 
KcsXform * KcsCreateXfrm(KcsStatus *aStat, 
    KcsChunkSet *aChunkSet, KcsChunkId aChunkId,
    KcsAttributeSet *aAttrSet);

KcsCreateXfrm() creates an instance of a KcsXform derivative.