ication</a> defines
'beginning of stream' and 'end of stream' page markers via a header
flag (it is possible for a stream to consist of a single page). A
stream always consists of an integer number of pages, an easy
requirement given the variable size nature of pages.</p>

<p>In addition to the header flag marking the first and last pages of a
logical bitstream, the first page of an Ogg bitstream obeys
additional restrictions. Each individual media mapping specifies its
own implementation details regarding 