This file is indexed.

/usr/share/icons/elementary-xfce-dark/index.theme is in xubuntu-icon-theme 14.04.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Icon Theme]
Name=elementary Xfce dark
Comment=Addon for dark panels
Inherits=elementary-xfce

Example=directory-x-normal

#Directory list
Directories=panel/16,panel/22,panel/24,panel/48,

[panel/16]
Size=16
Context=Status
Type=Fixed

[panel/22]
Size=22
Context=Status
Type=Fixed

[panel/24]
Size=24
Context=Status
Type=Fixed

[panel/48]
Size=48
MinSize=25
MaxSize=64
Context=Status
Type=Scalable