[IPP] [UNKN] Issue #18: Allow rangeOfInteger for x-dimension and y-dimension in media-col-database

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[Issue Unconfirmed]

The "media-col-database" attribute needs to allow for rangeOfInteger values
for trays that accept variable size media, such as rolls (y-dimension is
rangeOfInteger) and manual feed trays that accept custom media sizes
(x-dimension and y-dimension are rangeOfInteger).

Link: http://www.pwg.org/issues/18