S2REd is a syntactic-semantic text-based RuleML editor. It is a full-fledged textual XML editor that features: syntax highlighting, spell checking, brace matching, code block coloring, pretty-printing, well-formedness & validation checking. Nevertheless, S2REd is more than an XML editor. Via its STM (Semantic Tag Mapping) window, the user can manually define the correspondence between the tags of the loaded vocabulary and the various concepts of the rule base. In essence, STM provides a meta-modeling facility for generating schemas over various RuleML language versions. In reality, the meta-model is a specification of a domain-specific modeling language.
