ABB card stock PE1315A

ABB card stock PE1315A

Technical data of product parameters

When an PE1315A modifies a structure element or its contents, the change may
affect the validity of attribute information attached to that structure element by
other applications. A system of revision numbers allows applications to detect
such changes and update their own attribute information accordingly, as described in this section.
A structure element has a revision number, stored in the R entry in the structure
element dictionary (see Table 10.10 on page 858). Initially, the revision number is
0 (the default value if no R entry is present). When an application modifies the
structure element or any of its content items, it may signal the change by PE1315A
incrementing the revision numberThe revision numbers are optional in both the A and C arrays. An attribute object
or class name that is not followed by an integer array element is understood to
have a revision number of 0.
Note: The revision number is not stored directly in the attribute object because a
single attribute object may be associated with more than one structure element
(whose revision numbers may differ).
When an attribute object is created or modified, its revision number is set to the PE1315A
current value of the structure element’s R entry. By comparing the attribute object’s revision number with that of the structure element, an application can determine whether the contents of the attribute object are still current or whether
they have been outdated by more recent changes in the underlying structure element. Changes in an attribute object do not change the revision number of the associated structure element, which changes only when the structure element itself or
any of its content items is modified

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