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For determining whether a style in a project drawing is identical to a project
standard style, the GUIDs of both are compared. The GUID is a unique string
that is newly created for each version of a standard object. In the project
standards drawing, a list of previous GUIDs is kept as a version history to
enable comparison with objects in a project drawing.
If the synchronization process finds a style or display setting in a project
drawing that has the same type, name, and version GUID as the corresponding
style or display setting in the project standards drawing, it concludes that the
style or display setting is a standard one, and in synch with the object in the
project standards drawing. In that case, no change is necessary.
If the comparison finds that the GUID in the project drawing does not match
the GUID of the style in the project standards drawing, but matches a previous
GUID from the standard style version list, it labels the style in the project
drawing an “older version of a standard style.”
If the comparison finds a style or display setting that matches a standard object
in name and object type, but has a GUID not appearing in the version history
of the standard style or display setting, the style or display setting in the project
drawing is labeled “nonstandard (newer) version of standard object.”
NOTE Synchronization does not perform a property-by-property comparison
between the versions. The reason for this is that such a comparison would slow
down the software considerably, and that the GUID, date and time stamp in the
version information provides sufficient information to identify changes.
Creating Versions
A new version of a standard style or display setting in a project drawing is
created automatically each time the style or display setting is changed in Style
Manager or Display Manager.
A new version of a standard style or display setting in a project standards
drawing must be created manually when the style or display setting is changed
in Style Manager or Display Manager. In project standards drawings, a version
history for each standard style and display setting is also stored. The version
history is used during synchronization to determine if styles or display settings
in project drawings match the versions in the project standards drawing, or
are newer or older versions.
Versioning Exceptions for Display Settings in Project Standards Drawings
There are a few cases where modifications to the display settings will not be
automatically versioned, as this will in most use cases not be a desirable effect.
662 | Chapter 8 Project Standards
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