extern type no_spaces;
{{Any string with no space characters}}
+extern type no_newlines;
+{{Any string with no newline characters}}
+
extern type ip;
{{An IP address}}
extern type your_domain;
{{A domain that you're allowed to configure}}
+extern type your_domain_host;
+{{Some host (as a fully-qualified domain name) in one of your domains}}
+
extern type node;
{{The name of a server controlled by domtool}}