IETF Network Working Group, Internet-Draft
Reference: draft-ietf-cnrp-12.txt
Common Name Resolution Protocol (CNRP)
XML DTD for CNRP

From: http://www.ietf.org/internet-drafts/draft-ietf-cnrp-12.txt
Also: http://xml.coverpages.org/draft-ietf-cnrp-12.txt

5. XML DTD for CNRP


   <!-- The document tag -->
   <!ELEMENT cnrp (query|results|servicequery)>


   <!-- Used to request a Service object -->
   <!ELEMENT servicequery EMPTY>


   <!-- A query can either request a schema, a specific record by -->
   <!-- id, or a common-name with a set of properties (or         -->
   <!-- assertions) about the entity doing the query.             -->
   <!ELEMENT query (id|(commonname,property*))>
   <!ELEMENT id (#PCDATA)>


   <!ELEMENT commonname (#PCDATA)>
   <!-- NOTE: CNRP defines several well known properties          -->
   <!-- and types. See Appendix A for details.                    -->
   <!ELEMENT property (#PCDATA)>

   <!-- The name of the property -->
   <!ATTLIST property name CDATA #REQUIRED>
   <!-- The type of the property -->
   <!ATTLIST property type CDATA "freeform">

   <!ELEMENT results (status? |
                      ( service+,
				( status  | resourcedescriptor | referral )*
				     )*
					  )>

   <!ELEMENT resourcedescriptor (commonname,id,resourceuri,
       serviceref, datasetref?,
       description,
       property*)>
   <!ATTLIST resourcedescriptor id ID #IMPLIED>


   <!-- The entire point of all this... -->
   <!ELEMENT resourceuri (#PCDATA)>
   <!ELEMENT description (#PCDATA)>

   <!ELEMENT referral (serviceref, datasetref?)>
   <!ATTLIST referral id ID #IMPLIED>

   <!ELEMENT status (#PCDATA)>
   <!ATTLIST status code CDATA #REQUIRED>
   <!ATTLIST status ref IDREF #IMPLIED>

   <!-- serviceRef is used to point to one of a set of provided   -->
   <!-- service objects. This is so that a resource can point to  -->
   <!-- which service it came from. We could include the entire   -->
   <!-- service object but then we would be repeating large       -->
   <!-- amounts of information.                                   -->

   <!ELEMENT serviceref EMPTY>
   <!ATTLIST serviceref ref IDREF #IMPLIED>

   <!ELEMENT service (serviceuri, dataset*,
      servers?,
      description?,
      property*,propertyschema?,queryschema?,resourcedescriptorschema?,
      serviceschema?)>
   <!-- The time to live of the schema in seconds since it was   -->
   <!-- retrieved -->
   <!ATTLIST service ttl CDATA "0">
   <!ATTLIST service id ID #IMPLIED>
   <!ELEMENT serviceuri (#PCDATA)>
   <!ELEMENT servers (server+)>
   <!ELEMENT server (serveruri, property*)>
   <!ELEMENT serveruri (#PCDATA)>

   <!ELEMENT dataset (property*)>
   <!ATTLIST dataset id ID #IMPLIED>

   <!ELEMENT datasetref EMPTY>
   <!ATTLIST datasetref ref IDREF #IMPLIED>

   <!ELEMENT propertyschema (propertydeclaration*)>
   <!ELEMENT propertydeclaration (propertyname, propertytype*)>
   <!ATTLIST propertydeclaration id ID #IMPLIED>


   <!ELEMENT propertyname (#PCDATA)>
   <!ELEMENT propertytype (#PCDATA)>
   <!-- This specifies if the type is meant to be the default -->
   <!-- type. This is usually reserved for "freeform".        -->
   <!ATTLIST propertytype default (no|yes) "no">


   <!-- The properties you can use in a query -->
   <!ELEMENT queryschema (propertyreference*)>


   <!-- The properties you can expect to see in an Resource -->
   <!ELEMENT resourcedescriptorschema (propertyreference*)>


   <!-- The properties you can expect to find in a Service  -->
   <!-- definition -->
   <!ELEMENT serviceschema (propertyreference*)>


   <!ELEMENT propertyreference EMPTY>
   <!-- This specifies if a property is required as part of -->
   <!-- the query. -->
   <!ATTLIST propertyreference ref IDREF #REQUIRED>
   <!ATTLIST propertyreference required (no|yes) "no">