\begin{verbatim}

BASIC-SPEC ::= basic-spec BASIC-ITEMS*

BASIC-ITEMS ::= channel-items CHANNEL-ITEM+

| process-items PROCESS-ITEM+

| ...

CHANNEL-ITEM ::= channel-item CHANNEL+ SORT

PROCESS-ITEM ::= process-decl PROCESS-NAME PROCESS-PROFILE

| process-eq PROCESS-NAME VAR* PROCESS

| process-defn PROCESS-NAME ARG-DECL* ALPHABET PROCESS

PROCESS-PROFILE ::= process-profiles SORT* ALPHABET

ALPHABET ::= alphabet SORT-OR-CHANNEL*

SORT-OR-CHANNEL ::= SORT

| CHANNEL

| sorted-channel CHANNEL SORT

CHANNEL ::= SORT-ID

PROCESS-NAME ::= SORT-ID

PROCESS ::= skip

| stop

| div

| run EVENT-SET

| choas EVENT-SET

| cond-process FORMULA PROCESS PROCESS

| process-call PROCESS-SYMB TERM*

| hiding PROCESS EVENT-SET

| renaming PROCESS RENAMING

| event-process EVENT PROCESS

| term-event TERM PROCESS

| prefix-ext-choice VAR SORT PROCESS

| prefix-int-choice VAR SORT PROCESS

| sequence PROCESS PROCESS

| ext-choice PROCESS PROCESS

| int-choice PROCESS PROCESS

| generalized PROCESS EVENT-SET PROCESS

| alphabetized PROCESS EVENT-SET EVENT-SET PROCESS

| synchronous PROCESS PROCESS

| interleaved PROCESS PROCESS

EVENT-SET ::= event-set SORT-OR-CHANNEL*

PROCESS-SYMB ::= PROCESS-NAME

| qual-process-name PROCESS-NAME PROCESS-PROFILE

RENAMING ::= renaming ID+

EVENT ::= read-event CHANNEL VAR SORT

| write-event CHANNEL VAR SORT

| write-term CHANNEL TERM

\end{verbatim}