Information Technology Reference
In-Depth Information
«TV_Object»
Backend Business Server
«TV_ImplementableStandard»
EJB
Business Object
«TV_ImplementableStandard»
Linux
OperatingSystem
Middleware
«TV_ImplementableStandard»
CORBA
Memory
CPU
Storage
«TV_ImplementableStandard»
MemorySpec
«TV_ImplementableStandard»
Intel Core Duo
«TV_ImplementableStandard»
StorageStandard
FIGURE 6.2: Internal node structure and implementable standards.
used to provide the necessary basic operations using the chosen languages,
operating systems or hardware platforms.
6.2.3
IXIT
The technology language also plays a major role in the conformance testing
process. Conformance testing is based on the observation of the system im-
plementation at certain points defined in the specification to be conformance
points. These points are a subset of the set of reference points established in
the specification which need to be accessible for testing (see chapter 8 for more
detail). Although how they can be found is documented in this viewpoint,
the points themselves are typically associated with various kinds of accessible
interfaces defined in the engineering specification. Four classes of reference
point at which conformance tests can be applied are defined. The first is
a programmatic reference point representing a software interface, observable
via operating system logs or by the installation of portable interceptors. The
second is a perceptual reference point observed by direct inspection of the
physical system, looking at a screen or a mechanical actuator. The third is
an interworking reference point, checked by examining the messages passing
between systems, and the last is an interchange reference point, checked by
reading some portable medium produced, such as a CD-ROM or external hard
drive.
However, since a specification typically does not define a complete protocol
stack, but leaves some detailed choices to the implementer, an implementa-
tion needs to be accompanied by some extra explanation from the implementer
about how the implementation is structured and how the tester is to access
