Describes a query.

The Catalogs Engine may send queries to the client as part of specific operations, or as general callbacks.

Querys consist of a message and query items. A query can have just a message or just a range of query items or both.

The query message can be for example a disclaimer or a plain iformation message. The query message is intented to be shown separate from the query items.

If the query demands some input from the user it will contain query items. A query item defines one element of a whole query e.g. credit card number in a purchase information query.

Query objects can be used to query a wide variety of things from the client: disclaimers, user acceptance for web-connection usage, credit card information etc.

Example:

message: "Please enter creditcard information to complete the purchase" queryitem: "Creditcard owner:" queryitem: "Creditcard expiration date:" queryitem: "Creditcard number:"

Querys can be sent from a server at any time so the client needs to be prepared to handle them.

Most operations use querys when user interaction is needed.