<datafile_identification> contains enough information to
uniquely link the annotations to a given data file.
Section <signal_transform> records the possible transforms
applied to the signal when the annotations were created, that is, how
the signal was presented to an expert or algorithm. It may contain
sections <montage> and <filters>. Section
<tag_definitions> contains in this example definitions of
diverse groups of tags: sleep stages are marked in blocks of fixed
length (pages) and quantized starting points (at a page boundary).
The definition of "transients in C3" allows for arbitrary starting points
and durations of tags, but contains restriction to the channel number 10.
Finally, tags of type 'events' allow to mark any
epoch in any channel(s). In routine applications like e.g. sleep
stages scoring or marking artifacts, standard content of this section
can be automatically copied into this file.
Section <tag_data> contains the actual marks, in this example
limited to just a few. We observe that each of these tags can be
assigned an arbitrary length textual <annotation>.
