/usr/share/dbus-1/interfaces/org.kde.pim.IdentityManager.xml is in kdepimlibs5-dev 4:4.8.5-0ubuntu0.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | <!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.pim.IdentityManager">
<signal name="identitiesChanged">
<arg name="id" type="s" direction="out"/>
</signal>
</interface>
</node>
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