Changes

|Opens the database {{Code|$db}} and returns the node with the specified {{Code|$pre}} value.<br/>The ''pre'' [[Node Storage#Node Table|PRE value ]] provides access to a database node in constant time. It is not stored in the database. Instead, it is implicitly given by the order in which the XML nodes are visited by a SAX parser. As a result, but it will change whenever a node with a smaller ''pre'' values is added to or deleted from a database.