IEEE Power & Energy Magazine - January/February 2016 - 77
Using the CIM as a basis for all exchange payloads
ensures that the exchange content is clearly defined
in a standard way.
instance data expressed in rDf looks very flat and leverages
the file-scope uniqueness of data as defined by that syntax
through rDf identifiers. In the profile [figure 7(a)], this corresponds to the attribute "ref" (blue circle) and in the data file
[figure 8(a)] to the value in rdf:ID. To ensure that there is no
nesting at all, at the previous step (profile definition), the user
is supposed to apply shallow relationships (refs) to objects,
which will preserve the flatness of the data.
rDfs-based profiles are widely used for bulk network
data model exchanges, for either full models or the increments thereof. The syntax in itself is simple, and the language allows the definition of ontologies and reason on them.
on the challenging side, the tooling support for validation,
editing, and parsing is somewhat limited and may have a
steep learning curve.
with the need for utility organizations to exchange data
among heterogeneous systems and often without the need
for network models, the second flavor of syntax for payload
types emerged as a natural choice well suited for enterprise
integration: "vanilla" Xml that validates against the w3c
XsD. The translation of cIm profiles into the XsD syntax
is defined in Iec 62361-100 and is widely used for standard
as well as for custom profiles. This syntax is the mainstream
integration technology with a myriad tools supporting its
development. It is well understood by both application developers and integrators and is an integral part of web-enabled
technologies. The profiles defined with the XsD syntax in
mind have no limitation in structure and are indeed often
reflecting the "navigation path" through relationships from
the canonical cIm model. a graphical example is given in
figure 7(b), with the red rectangle. It is possible to use the
"shallow" references as in rDfs based profiles (blue circle);
however, there is no XsD native counterpart to rDf identifiers. Payloads may use cIm Identifiedobject.mrID for identification, but since distribution normally requires multiple
names for a specific device, a battery of name-related classes
container of L1230814041
10.50
Base Voltage
Level
10.50 kV
...
L1230814041
0.1
0.1
...
...
(a)
b9cd8d2a-56a2-45e3-89d0-caaabb9e2985
false
567fdc86-0ccd-4a96-a318-bdc1a3015643
true
(b)
figure 8. A sample (a) RDF and (b) XML syntax for CIM-based data.
january/february 2016
ieee power & energy magazine
77
Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - January/February 2016
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