mobileUrl property
//en.wikipedia.org/wiki/Responsive_web_design) in which content
can be flexibly adapted to a wide range of browsing environments
Pages and sites referenced with the long-established [url]
property should ideally also be usable on a wide variety of
devices, including mobile phones In most cases, it would be
pointless and counter productive to attempt to update all
[url] markup to use [mobileUrl] for more mobile-oriented
pages The property is intended for the case when items
(primarily [Product] and [Offer]) have extra URLs hosted on
an additional "mobile site" alongside the main one It should not
be taken as an endorsement of this publication style.
Implementation
String? mobileUrl;