VANTAGE Plant Design PDMS Software Customisation Reference M

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1 Introduction
This manual is the Reference Manual for the AVEVA Programming
Language, PML.
It is intended for users who are already familiar with PML. Users who are
starting to use PML should refer to the PDMS Software Customisation
Guide, which should be used together with this manual.
There are two versions of PML, the older one, known as PML 1, and the
newer one, known as PML 2. PML 2 has been written specifically for creating
and customising the AVEVA GUI, and this manual is mainly concerned with
PML 2.
However, PML 2 has not completely replaced PML 1, and there are some
tasks which are carried out more efficiently using PML 1 facilities. In
particular, this manual describes the PML 1 expressions package, which is
used within PDMS; for example, for writing rules and defining report
templates.