elements must only occur within a channel element elements must only occur within a channel element elements must have an rdf:parseType attribute with the value 'Literal' The element must contain at least one hour element There is a limit of 24 hour elements within a element elements must only occur within a channel element elements must have an rdf:parseType attribute with the value 'Literal' The element must contain at least one day element There is a limit of 7 day elements within a element elements can only occur in skipHours elements elements can only occur in skipHours elements elements can only occur within images. elements can only occur within items or images Days should be listed as Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday Hour values should be in the range 0-23 You must specify a valid language code within a language element Invalid language code Width elements should not be empty Height elements should not be empty