typedef enum ss_silrole_t {             /* NOTE: this used to be called VBT_SilRole_t with names like VBT_SROLE_TIME */
     SAF_SROLE_TIME,                     /* sil is a time-base */
     SAF_SROLE_SPACE,                    /* sil is for space */
     SAF_SROLE_STATE,                    /* for state space */
     SAF_SROLE_PARAM,                    /* sil is generic param space */
     SAF_SROLE_CTYPE,                    /* sil is for a cell */
     SAF_SROLE_ATYPE,                    /* sil is for an algebraic type */
     SAF_SROLE_USERD,                    /* sil has a user defined role */
     SAF_SROLE_SUITE                     /* for a suite */
 } ss_silrole_t