This Service is used to read one or more Attributes of one or more Nodes. For constructed Attribute values whose elements are indexed, such as an array, this Service allows Clients to read the entire set of indexed values as a composite, to read individual elements or to read ranges of elements of the composite.

The maxAge parameter is used to direct the Server to access the value from the underlying data source, such as a device, if its copy of the data is older than that which the maxAge specifies. If the Server cannot meet the requested maximum age, it returns its “best effort” value rather than rejecting the request.