We now briefly describe the structure and functionality of a query processor a process that transforms and executes a user-defined query against a database state and returns those instances that satisfy the query.

Please remove spaces between words.
Wenowbrieflydescribethestructureandfunctionalityofaqueryprocessoraprocessthattransformsandexecutesauser-definedqueryagainstadatabasestateandreturnsthoseinstancesthatsatisfythequery.