Information Technology Reference
In-Depth Information
Box 3. General layer: Other data
<general>
<description>
…
</description>
<related _ iles>
<related _ ileile _ name="playbill01.jpg"
file _ format=”image _ jpeg”
encoding _ format=”image _ jpeg”
description=”Playbill”/>
<related _ ile>…</related _ ile>
…
</related _ iles>
</general>
theless, these labels are particularly interesting
for music classification and retrieval. The XML
block displayed in Box 2 provides an example of
catalog metadata.
In addition, General layer can contain links
towards files that do not describe directly the piece
and its music events, but are strongly related and
can provide further information. For instance,
related files can contain iconographic material
and text contents. Needless to say, such objects
cannot be synchronized with music execution,
and they do not present any reference to spine
structure; nevertheless they belong to our concept
of comprehensive description of music.
As regards the aforementioned Puccini's aria,
our MX description could provide link towards
sketches, on stage photos, libretto, and score cov-
ers. Box 3 illustrates this case.
Logic layer contains what the author(s) intended
to put in the piece. If we look at a score as a se-
quence of music symbols, we should refer to its
“abstract” layout. For instance, characteristics of a
score such as the number of measures per system,
page margins, fonts, paper type, and format are
described in Notational layer, as they derive from
a graphical implementation of the score. In Logic
layer we find the same information, but unformat-
ted and disposed on a sort of virtual score. The
difference is illustrated by Figure 5, where we can
compare an abstract description of a chord to its
corresponding printed version: the former is the
logical description of the chord, where—among a
number of possible descriptions—we have chosen
an XML-based one; on the contrary, the latter is
the kind of description referred by Notational layer,
as we will explain later. Please note that the XML
Figure 5. A logic representation of a chord vs. a graphical one
<chordevent _ ref="p7v1 _ 69">
<notehead>
<pitchstep="E"octave="5"/>
<durationnum="1"den="1"/>
</notehead>
<notehead>
<pitchstep="G"octave="5"/>
<durationnum="1"den="1"/>
</notehead>
<notehead>
<pitchstep="C"octave="6"/>
<durationnum="1"den="1"/>
</notehead>
</chord>
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