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Hi Forum I created a browsable grammar of the PSS formal syntax at http://insights.sigasi.com/tech/pss.ebnf.html#constant_expression The hyperlinks make it easier to explore and verify the grammar. Please let me know if you see any mistakes. While creating this, I also ran some validations, and found following issues: * Rule “activity_constraint_stmt”: 'constraint' should be styled as a keyword * There are two rules called “struct_type”, I assume the one in “B.9 Data types” is wrong. * Rule “exec_kind_identifier” is also duplicated. This is not an identifier, so I assume it should be renamed. * Rule “scheduling_constraint”: "," should be marked as keyword * Rule “constraint_declaration”: allow an optional trailing semicolon? (e.g. as in example Example 3—DSL: enum data type ) * “expression_constraint_item”: shouldn’t the implicand_constraint_item be optional? i.e. “expression [ implicand_constraint_item ] | ;” I also noticed a missing “}” in Example 3 (DSL: enum data type) Kind regards, Hendrik