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diff --git a/schemas/relaxng/publication.rnc b/schemas/relaxng/publication.rnc
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+# $Id$
+#
+# RelaxNG schema for RPKI publication protocol, from current I-D.
+#
+# Copyright (c) 2014 IETF Trust and the persons identified as authors
+# of the code.  All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# * Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in
+#   the documentation and/or other materials provided with the
+#   distribution.
+#
+# * Neither the name of Internet Society, IETF or IETF Trust, nor the
+#   names of specific contributors, may be used to endorse or promote
+#   products derived from this software without specific prior written
+#   permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+default namespace =
+    "http://www.hactrn.net/uris/rpki/publication-spec/"
+
+# This is version 3 of the protocol.
+
+version = "3"
+
+# Top level PDU is either a query or a reply.
+
+start |= element msg {
+  attribute version { version },
+  attribute type    { "query" },
+  query_elt*
+}
+
+start |= element msg {
+  attribute version { version },
+  attribute type    { "reply" },
+  reply_elt*
+}
+
+# PDUs allowed in  queries and replies.
+
+query_elt = publish_query | withdraw_query | list_query
+reply_elt = publish_reply | withdraw_reply | list_reply | report_error_reply
+
+# Tag attributes for bulk operations.
+
+tag = attribute tag { xsd:token { maxLength="1024" } }
+
+# Base64 encoded DER stuff.
+
+base64 = xsd:base64Binary
+
+# Publication URIs.
+
+uri = attribute uri { xsd:anyURI { maxLength="4096" } }
+
+# Digest of objects being withdrawn
+
+hash = attribute hash { xsd:string { pattern = "[0-9a-fA-F]+" } }
+
+# Error codes.
+
+error = xsd:token { maxLength="1024" }
+
+# <publish/> element
+
+publish_query = element publish { tag?, uri, hash?, base64 }
+publish_reply = element publish { tag?, uri }
+
+# <withdraw/> element
+
+withdraw_query = element withdraw { tag?, uri, hash }
+withdraw_reply = element withdraw { tag?, uri }
+
+# <list/> element
+
+list_query = element list { tag? }
+list_reply = element list { tag?, uri, hash }
+
+# <report_error/> element
+
+report_error_reply = element report_error {
+  tag?,
+  attribute error_code { error },
+  xsd:string { maxLength="512000" }?
+}
+
+# Local Variables:
+# indent-tabs-mode: nil
+# comment-start: "# "
+# comment-start-skip: "#[ \t]*"
+# End: