It contains tips and tricks and sample code for intermediate to advanced Visio users and developers (and a few occasional ramblings about other stuff too).
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I am the author of four books about Visio …
Mastering Data Visualization with Microsoft Visio Professional 2016
Microsoft Visio 2013 : Business Process Diagramming and Validation
Microsoft Visio 2010 : Business Process Diagramming and Validation
Visualizing Information with Microsoft® Office Visio® 2007