Flags that specify required properties (or required-not-present properties) for a dependency to be returned from a query. Values in this enum correspond to values in EDependencyProperty; each EDependencyProperty value has a positive and negative equivalent in this enum. This allows a single bitfield to indicate required-present, required-not-present, or dont-care for each property. For any category-specific values, those values apply only to dependencies in the category, and do not impose restrictions on dependencies from other categories.