<!ELEMENT rpsl_syntax (attribute_syntax)+>

<!ELEMENT attribute_syntax (core?, front_end?, description)>
<!ATTLIST attribute_syntax
          name   CDATA     #REQUIRED
>

<!ELEMENT core (regex?, reserved_regex?)>

<!ELEMENT front_end (regex?, reserved_regex?, parser_name?)>

<!ELEMENT description (#PCDATA)>

<!ELEMENT regex (#PCDATA)>

<!ELEMENT reserved_regex (#PCDATA)>

<!ELEMENT parser_name (#PCDATA)>

