The PresentationScanMode enumeration defines which external resources should be searched for while performing the presentation scan.  It is used for the IPresentation interface. 

Possible values are:

PSM_DEFAULT = 0: Resources linked by both absolute and relative paths will be listed.
PSM_CHECK_EXTERNAL_RESOURCE_RELATIVE_PATH = 1: Only resources linked by relative path will be listed.
PSM_CHECK_EXTERNAL_RESOURCE_ABSOLUTE_PATH = 2: Only resources linked by absolute path will be listed.