Information Technology Reference
In-Depth Information
digital objects, or something derived from them, are eventually rendered but the
point is that there are an infinite number of different ways of processing, most
of which have not been invented yet, and most of which will involve being com-
bined with data which has not been collected yet. Therefore the Representation
Information we need is that which will allow us to extract the individual pieces
of information such as numbers or characters, as described in Sect.
7.3
, together
with their associated Semantic information as described in Sect.
7.5
.
The following is an example of such a digital object and its Representation
Information.
7.7.4.1 Nasa Ames
NASA AMES is another scientific data format for data exchange, the overall NASA
AMES file format has a number of subtypes, each having differing structures for
header and data records, for example a description of the NASA AMES versions can
be found at
http://espoarchive.nasa.gov/archive/docs/formatspec.txt
which includes
a BNF description of Version 2. This version 2 format is an ASCII file and can
also be described using a Data Request Broker (DRB) description, partly shown in
Fig.
7.14
. The description has been specialized for the scientific application of stor-
ing data collected by the Mesosphere-Stratosphere-Troposphere (MST) Radar. The
description has the addition of domain specific parameter semantics detailed in the
XML schema documentation tags. For instance the TropopauseAltitude parameter
is described as an integer represented in ASCII with a description of the parameter.
The XML schema declaration is shown as:
<xs:element name
=
"TropopauseAltitude" type
=
"xs:int">
<xs:annotation>
<xs:documentation xml:lang
=
"en">
(m)This is the altitude of the(static stability)
tropopause, in metres above mean sea level,
</xs:documentation>
<xs:appinfo>
<sdf:block>
<sdf:encoding>ASCII</sdf:encoding>
</sdf:block>
</xs:appinfo>
</xs:annotation>
</xs:element>
