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4.1.7.3 Syntax of Sentences as Terms

sentence::= module : sentence
| list{ where list is a list of sentence }
| clause
| directive
| query
| grammar-rule
clause::= rule | unit-clause
rule::= head :- body
unit-clause::= head{ where head is not otherwise a sentence }
directive::= :- body
query::= ?- body
head::= module : head
| goal{ where goal is not a variable }
body::= module : body
| body -> body disj body
| body -> body
| \+ body
| body disj body
| body , body
| once(body)
| do(iter,body)
| if(body,body,body)
| term ^ body
| goal
goal::= term{ where term is not otherwise a body }
grammar-rule::= gr-head --> gr-body
gr-head::= module : gr-head
| gr-head , terminals
| non-terminal{ where non-terminal is not a variable }
gr-body::= module : gr-body
| gr-body -> gr-body disj gr-body
| gr-body -> gr-body
| \+ gr-body
| gr-body disj gr-body
| gr-body , gr-body
| once(gr-body)
| do(iter,gr-body)
| if(gr-body,gr-body,gr-body)
| term ^ gr-body
| non-terminal
| terminals
| gr-condition
non-terminal::= term{ where term is not otherwise a gr-body }
terminals::= list | string
gr-condition::= ! | {body}
module::= atom
disj::= ; | |{ read as ; unless | is declared infix }
iter::= iter , iter
| fromto(term,term,term,term)
| foreach(term,term)
| foreacharg(term,term)
| foreacharg(term,term,term)
| count(term,term,term)
| for(term,term,term)
| param(term)


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