Global exchange of information
required that the format of CAD/CAM have a common set of tools, using a neutral
standard for transferring information across heterogeneous systems. This
drastically reduces the requirement for translators.
To improve the control over the
various exchange process and to reduce the number of necessary converters one
may use CAD transfer standards. Well known standards include IGES, DXF and
STEP. An interface can be regarded as an
aggregate of conditions, rules and conventions which defined the information
exchange between two communicating objects. The language or user interface is
the window through which the user can communicate with the CAD module.
GKS is one standard interface. It
defines a language independent nucleus for operating a graphic system. IGES is
concerned with the exchange of product description data. This exchange takes
place via a neutral data format. IGES has versions 1.0 to 5.0. A regular up gradation of the
interfaces is required for solving the problems faced in the previous versions.
Once IGES being used extensively, its weaknesses were identified which
eventually led to a new standard called PDDI, developed through the Air force
ICAM programme. The purpose of PDDI was to develop a mechanism to allow
complete exchange or sharing of product model data directly among computer
application without human intervention.
For standards based on a broader
automation goal a new discipline of information modelling, i.e. PDES was
developed.
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