- Clause is a tuple-tree in the following recursive form:
- ('AND', c1, c1), ('OR', c1, c2), ('NOT', c1),
- ('==', e1, e2), ('!=', e1, e2) where e1, e2 are `ConfigExpression`s.
+ Clause is a tuple-tree in the following recursive form::
+
+ ('AND', c1, c1), ('OR', c1, c2), ('NOT', c1), ('==', e1, e2), ('!=', e1, e2)
+
+ where e1, e2 are `ConfigExpression`, c1, c2, `ConfigCondition`.