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* Simple mapping service interface.
interface nsIProperties : nsISupports
* Gets a property with a given name.
* @return NS_ERROR_FAILURE if a property with that name doesn't exist.
* @return NS_ERROR_NO_INTERFACE if the found property fails to QI to the
* given iid.
void get(in string prop, in nsIIDRef iid,
[iid_is(iid),retval] out nsQIResult result);
* Sets a property with a given name to a given value.
void set(in string prop, in nsISupports value);
* Returns true if the property with the given name exists.
boolean has(in string prop);
* Undefines a property.
* @return NS_ERROR_FAILURE if a property with that name doesn't
* already exist.
void undefine(in string prop);
* Returns an array of the keys.
void getKeys(out PRUint32 count, [array, size_is(count), retval] out string keys);