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All item objects have properties. The properties have attributes. For instance, property attributes indicate whether a property is read from, written to, or deleted. They also indicate the valid property values. The following constants are valid property attributes:
| Property Attribute | Meaning |
|---|---|
| WIA_PROP_CACHEABLE | The device can cache the property's value. |
| WIA_PROP_FLAG | The property has a list of legal flag values. Flag values are combined using a bitwise OR operation. |
| WIA_PROP_LIST | The property has a list of legal values. |
| WIA_PROP_NONE | The property does not have any valid values associated with it. |
| WIA_PROP_RANGE | The property has a range of valid values. |
| WIA_PROP_READ | The application can read the property's value. |
| WIA_PROP_RW | The application can read and write the property's value. |
| WIA_PROP_SYNC_REQUIRED | Do not use. |
| WIA_PROP_WRITE | The application can write the property's value. |