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/usr/share/sdformat/1.0/state.sdf is in sdformat-sdf 2.0.0-6.

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The actual contents of the file can be viewed below.

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<!-- State Info -->
<element name="state" required="*">
  <!-- Name of the world this state applies to -->
  <attribute name="world_name" type="string" default="__default__" required="1"/>

  <!-- Time stamp of the state [seconds nanoseconds] -->
  <attribute name="time" type="time" default="0 0" required="0"/>

  <!-- State information for a model -->
  <element name="model" required="+">
    <attribute name="name" type="string" default="__default__" required="1"/>
    <element name="pose" type="pose" default="0 0 0 0 0 0" required="1"/>

    <!-- State information for a link -->
    <element name="link" required="*">
      <attribute name="name" type="string" default="__default__" required="1"/>
      <element name="pose" type="pose" default="0 0 0 0 0 0" required="1"/>
      <element name="velocity" type="pose" default="0 0 0 0 0 0" required="0"/>

      <!-- Zero or more wrenches -->
      <element name="wrench" required="*">
        <element name="pos" type="vector3" default="0 0 0" required="0"/>
        <element name="mag" type="pose" default="0 0 0 0 0 0" required="1"/>
      </element>

    </element> <!-- End Link -->
  </element> <!-- End Model -->
</element> <!-- End State -->