whats the total number of rs in:
this section defines how to use the oasis standard ws-trust 1.3 to implement the logical operations of the efa policy provider by means of technical bindings.
the actor efa policy provider shall be implemented as security token service (sts) in terms of the ws services trust model.
such retrieval of an ecr access policy from an ecr providers policy provider service is bound to the oasis ws-trust 1.3 requestsecuritytoken (rst) and requestsecuritytokenresponse (rstr) messages. this efa binding introduces extensions and restrictions on the respective ws trust 1.3 definitions.
the requestor shall send a requestsecuritytoken message as defined in ws-trust 1.3. the format of the message should be soap version 1.2.
:the value of ecrref.purpose must be encoded with the ihe-xacml binding for [[ihecb:ihe-xacml_binding#code|ihe-xacml binding for folder.codelist]].
:the value of ecrref.purpose must be encoded with the [[ihecb:ihe-xacml_binding#code|ihe-xacml binding for folder.codelist]].
:the value of ecrref.patientid must be encoded with the ihe-xacml binding for [[ihecb:ihe-xacml_binding#patient_id_2|ihe-xacml binding for folder.patientid]].
the sts shall authenticate the requester by validating the soap security header and the efa identity assertion. if the authentication fails the sts responds with a fault code.

user
I counted 66 "r"s in that text.
assistant