Globally Unique Identifiers
Visio utilizes Globally Unique Identifiers in the same manner that Microsoft does: as a mechanism for establishing a total uniqueness for any given object. In this manner, you can establish a reliable correspondence between a specific SmartShape symbol and an external source of data from a database. This is preferable to using sheet identifiers or symbol names.
A Globally Unique Identifier, or GUID, is stored internally as a 128-bit value and is passed as a null-terminated, 39-character string. Be aware that by default all masters have a GUID, but individual SmartShape symbols do not. If a SmartShape symbol or Master SmartShape symbol has a GUID, you may safely assume that no other SmartShape symbol or Master SmartShape ...
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