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<!--
Copyright 2008 Free Software Foundation, Inc.
This file is part of GNU Radio

SPDX-License-Identifier: GPL-2.0-or-later

-->
<!--
    flow_graph.dtd
    Josh Blum
    The document type definition for flow graph xml files.
 -->
<!ELEMENT flow_graph (timestamp?, block*, connection*)> <!-- optional timestamp -->
<!ELEMENT timestamp (#PCDATA)>
<!-- Block -->
<!ELEMENT block (key, param*, bus_sink?, bus_source?)>
<!ELEMENT param (key, value)>
<!ELEMENT key (#PCDATA)>
<!ELEMENT value (#PCDATA)>
<!ELEMENT bus_sink (#PCDATA)>
<!ELEMENT bus_source (#PCDATA)>
<!-- Connection -->
<!ELEMENT connection (source_block_id, sink_block_id, source_key, sink_key)>
<!ELEMENT source_block_id (#PCDATA)>
<!ELEMENT sink_block_id (#PCDATA)>
<!ELEMENT source_key (#PCDATA)>
<!ELEMENT sink_key (#PCDATA)>