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/usr/share/dbus-1/interfaces/com.canonical.hud.query.xml is in hud 14.10+17.10.20170619-0ubuntu2.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<node name="/">
	<interface name="com.canonical.hud.query">
<!-- Properties -->
		<property name="ResultsModel" type="s" access="read" />
		<property name="AppstackModel" type="s" access="read" />
		<!-- Note, this is read only, to update use the update function so
		     that you get the model revision to ensure you've got the data -->
		<property name="CurrentQuery" type="s" access="read" />
		<property name="ToolbarItems" type="as" access="read" />

<!-- Functions -->
		<method name="UpdateQuery">
			<!-- in -->
			<arg type="s" name="query" direction="in" />
			<!-- out -->
			<arg type="i" name="modelRevision" direction="out" />
		</method>
		
		<method name="VoiceQuery">
			<!-- out -->
			<arg type="i" name="modelRevision" direction="out" />
			<arg type="s" name="query" direction="out" />
		</method>

		<method name="UpdateApp">
			<!-- in -->
			<arg type="s" name="app" direction="in" />
			<!-- out -->
			<arg type="i" name="modelRevision" direction="out" />
		</method>

		<method name="CloseQuery">
		</method>

		<method name="ExecuteCommand">
			<!-- in -->
			<arg type="v" name="item" direction="in" />
			<arg type="u" name="timestamp" direction="in" />
		</method>

		<method name="ExecuteParameterized">
			<!-- in -->
			<arg type="v" name="item" direction="in" />
			<arg type="u" name="timestamp" direction="in" />
			<!-- out -->
			<arg type="s" name="busName" direction="out" />
			<arg type="s" name="prefix" direction="out" />
			<arg type="s" name="baseAction" direction="out" />
			<arg type="o" name="actionPath" direction="out" />
			<arg type="o" name="modelPath" direction="out" />
			<arg type="i" name="modelSection" direction="out" />
		</method>

		<method name="ExecuteToolbar">
			<!-- in -->
			<arg type="s" name="item" direction="in" />
			<arg type="u" name="timestamp" direction="in" />
		</method>

<!-- Signals -->
		<!-- Most update signals come through the Dee model -->

		<signal name="VoiceQueryLoading">
		</signal>

		<signal name="VoiceQueryListening">
		</signal>
		
		<signal name="VoiceQueryHeardSomething">
		</signal>

<!-- End of interesting stuff -->

	</interface>
</node>