http://projectbaird.com/ns/ is the namespace used for Project
Baird-specific XML elements, attributes and link relations.
dtstart: XML attribute; when attached to an
atom:link, indicates the start of an availability window (ISO 8601 format datetime)
dtend: XML attribute; when attached to an
atom:link, indicates the end of an availability window (ISO 8601 format datetime)
serviceClass: Specifies the class of service provided by the linked resource (applicable values are
delivery: Specifies the delivery mechanism of a linked resource (applicable values are
media: Specifies the media query which must be satisfied to present the linked resource; aligned with CSS3 Media Queries
serviceNumberPreference: Specifies the numeric channel number which should be allocated to the service if possible. Multiple values may be given, separated by breaking whitespace characters Values may take the form of a channel number, or may be in the form
platformis the URI of a service which the device supports (described separately; intent is to allow different channel numbering schemes between platforms; e.g., BBC 1 on Sky Digital and Virgin Media is 101, on Freeview is 1, on UPC Netherlands is 19, etc.)
width: Specifies the width, in pixels, of the linked resource (principally for foaf:Description, but also for po:Channel subclasses)
height: Specifies the height, in pixels, of the linked resource (principally for foaf:Description, but also for po:Channel subclasses)
preferredBackground: Specifies the preferred matte background colour which should be used for the container of the linked resource, if possible (for foaf:Depiction); format is
#rgb; symbolic colour names are not supported.