creo5 Drawing Setup option documentation for: GTOL_DATUMS 
gtol_datums
Sets the drafting standard for displaying reference datums within drawings. This affects the display of axes, datum planes and reference part datums.
Default and Available Settings:
std_ansi*
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std_ansi_mm
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std_iso
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std_jis
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std_din
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std_iso_jis
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std_ansi_dashed
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std_asme
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