# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`SDO_DAS_ChangeSummary::NONE`=0 (int)
  Represents a change type of 'none'.
`SDO_DAS_ChangeSummary::MODIFICATION`=1 (int)
  Represents a change type of 'modification'.
`SDO_DAS_ChangeSummary::ADDITION`=2 (int)
  Represents a change type of 'addition'.
`SDO_DAS_ChangeSummary::DELETION`=3 (int)
  Represents a change type of 'deletion'.