Shinano Kenshi PTP 1, Руководство пользователя

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3.4.1. Navigation levels.
A DAISY book can have up to 6 levels of navigation. The number of
levels in a book will depend on the structure of the original book. The
levels are hierarchical with Level 1 the highest and Level 6 the lowest.
This can be thought of as being similar to the hierarchy of a contents
listing in a book, in the sense that there are major items and then sub
items within them and so on. Every heading that has been coded into
a DAISY book will have an associated navigation level between 1 and
6.
There are no fixed rules about how the DAISY navigation levels
should be used and people's views on how this should be done would
vary. For simple books, which only have chapters, it is likely that only
one level will be used. For more complex books, which may have
chapters, sections and sub sections , there might be 3 levels used
( Level 1 for chapters, Level 2 for sections and Level 3 for sub
sections). Once the book has been created, the levels of navigation
are fixed and cannot be altered by the reader.
When trying to find a specific part of a book, the reader would tend to
use a higher level (perhaps Level 1 or Level 2) to find the main area
of interest, and would then change to a lower level of navigation to
home in on the information they are looking for. This allows them to
bypass large portions of the book that they have no interest in at that
time.
3.4.2. Headings.
In order to use the navigation levels mentioned above, the location of
all relevant navigation points has to be marked in the recording. In
the context of this guide, these markers are called headings. Once a
heading has been inserted into the DAISY recording, it can then be
assigned a navigation level depending on the structure of the original
book. When headings are inserted, they are numbered automatically