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Query objects represents queries.

     ZOOM_query ZOOM_query_create(void);

     void ZOOM_query_destroy(ZOOM_query q);

     int ZOOM_query_prefix(ZOOM_query q, const char *str);

     int ZOOM_query_sortby(ZOOM_query q, const char *criteria);

Create query objects using ZOOM_query_create and destroy them by calling ZOOM_query_destroy. RPN-queries can be specified in PQF notation by using the function ZOOM_query_prefix. More query types will be added later, such as CCL to RPN-mapping, native CCL query, etc. In addition to a search, a sort criteria may be set. Function ZOOM_query_sortby specifies a sort criteria using the same string notation for sort as offered by the YAZ client.