/etc/caldavd/accounts.dtd is in calendarserver 5.2+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (c) 2006-2014 Apple Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!ELEMENT accounts (user*, group*, resource*, location*) >
<!ATTLIST accounts realm CDATA "">
<!ELEMENT user (uid*, guid, password?, name?, first-name?, last-name?, email-address*)>
<!ATTLIST user repeat CDATA "1">
<!ELEMENT group (uid*, guid, password?, name?, members)>
<!ATTLIST group repeat CDATA "1">
<!ELEMENT resource (uid*, guid, password?, name?,)>
<!ATTLIST resource repeat CDATA "1">
<!ELEMENT location (uid*, guid, password?, name?,)>
<!ATTLIST location repeat CDATA "1">
<!ELEMENT member (#PCDATA)>
<!ATTLIST member type (users|groups|locations|resources) "users">
<!ELEMENT uid (#PCDATA)>
<!ELEMENT guid (#PCDATA)>
<!ELEMENT password (#PCDATA)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT first-name (#PCDATA)>
<!ELEMENT last-name (#PCDATA)>
<!ELEMENT email-address (#PCDATA)>
<!ELEMENT members (member*)>
>
|