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/usr/share/dbus-1/interfaces/org.kde.juk.search.xml is in juk 4:17.12.3-0ubuntu1.

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<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
  <interface name="org.kde.juk.search">
    <method name="searchText">
      <arg type="s" direction="out"/>
    </method>
    <method name="setSearchText">
      <arg name="text" type="s" direction="in"/>
    </method>
  </interface>
</node>