The Components window contains all the XQuery functions and operators that you can use in your XQuery maps. These functions and operators can be dragged and dropped to the center pane of the XQuery Mapper. You can also drag and drop a function onto a target tree node, if the target tree node has already been created using the Insert context menu option.

When a function is dragged and dropped on an existing link between a source and target node, for example, it becomes a part of the expression corresponding to that link. Some functions without parameters must be dragged to an empty area of the center pane, and associated with a target node. Functions can also be chained together.

The Components window organizes the XQuery function and operators into the following categories:

• XQuery Functions: Includes various categories of XQuery functions, like aggregate functions, date functions, mathematical functions, string functions, and so on.

• XQuery Constructs: Includes standard XQuery constructs like If-Then-Else and FLWOR constructs.

• XQuery Operators: Includes various categories of XQuery operators, like logical operators, node comparison operators, and so on.

• User-Defined Functions: Includes all the functions that you have defined in the current XQuery map file, and any functions from imported library modules.

• My Components: Includes your favorite components that you can add to this category. It also includes the recently used functions.