http://www.cadfamily.com/a/CAD_CAID/Plant/Software-Customisation-Reference-Manual_3686.html
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. You should also refer to the Database Management Reference
Manual.
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