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What is the Purpose Number for? I noticed several API's like, camlib_GetPurposeNumber() and camlib_SetPurposeNumber()

The "Purpose Number" is an integer that you can use for any purpose.  

For example during netlist extraction you could temporarily use the Purpose to assign a value for each connected object.  Afterwards, search all metal layers and group objects with the same purpose number and the assign them to a net.

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