url - Location to load a resource from. Note that this is slightly different from the link tag, which specifies where a user should be re-directed to if a resource is selected.
link - This is a url that a user is expected to click on, as opposed to a url that is for loading a resource, such as an image.
width - Specifies the width of an image in pixels. Should be an integer value.
height - Specifies the height of an image in pixels. Should be an integer value.
description - A plain text description of an item, channel, image, or textinput.
textinput - An input field for the purpose of allowing users to submit queries back to the publisher's site.
lastBuildDate - The last time the channel was modified.
docs - This tag should contain a URL that references a description of the channel.
managingEditor - The email address of the managing editor of the site, the person to contact for editorial inquiries.
webMaster - The email address of the webmaster for the site, the person to contact if there are technical problems with the channel.
skipHours - A list of hours indicating the hours in the day, GMT, when the channel is unlikely to be updated. If this sub-item is omitted, the channel is assumed to be updated hourly.
hour - Specifies an hour of the day. Should be an integer value between 0 and 23. See skipHours.
skipDays - A list of days of the week, in English, indicating the days of the week when your channel will not be updated. As with activeHours, if you know your channel will never be updated on Saturday or Sunday, for example.
day - The day of the week, spelled out in English.
