nfo

var (
	ErrNoTitle          = errors.New("no title found")
	ErrMultipleTitles   = errors.New("multiple titles found")
	ErrNoWidth          = errors.New("no width found")
	ErrMultipleWidths   = errors.New("multiple widths found")
	ErrInvalidWidth     = errors.New("invalid width, must be a positive integer")
	ErrNoHeight         = errors.New("no height found")
	ErrMultipleHeights  = errors.New("multiple heights found")
	ErrInvalidHeight    = errors.New("invalid height, must be a positive integer")
	ErrMultipleEditions = errors.New("multiple editions found")
)

var (
	ErrBadXml           = errors.New("invalid xml")
	ErrBadRootNamespace = errors.New("root tag namespace should be empty")
	ErrBadRootTag       = errors.New("unexpected root tag")
)