===== The Element ===== ==== Definition and Usage ==== The [[rulebase|]] element groups a set of rules specified in [[rule|]] and [[compositerule|]] elements. The specification of rules in NCL 3.0 was done in a separate module, because they are useful for defining either alternative components or alternative descriptors. ==== Syntax ==== ^ Element ^ Attributes ^ Content ^ Parent ^ | [[rulebase|]] | //id// | ([[importbase|]] | [[compositerule|]] | [[rule|]])+ | [[head|]] | ==== Attributes ==== ^ Name ^ Value ^ Description ^ | //id// | It may receive any string value that begins with a letter or an underscore and that only contains letters, digits, <".">, and <"_">. | The //id// attribute uniquely identifies the element within a document. |