Exam 9: Working With Xml and Databases

In a FLWOR query, only one where clause is allowed per query, and it must be placed before all of the for and let clauses.

The XQuery prolog declaration _____ specifies whether empty elements should appear last in any node ordering or first.

In XQuery, variables are assigned using the _____ symbol.

The _____ module is the XQuery file that contains the query to be executed and any variables or functions declared in the query prolog.

You can automatically generate comments for your query through the use of _____ comments, which are a standard method for creating structured documentation.

With XQuery, the user can summarize data with aggregate functions.

Alfonso has been working with XQuery, and would like to create a library module to centralize the global variables and functions he's created. He has encountered some problems in implementing the library module, and comes to you for help. -Alfonso has placed several global variables in his library module. However, when he references one of these variables in a query main module, an error occurs. In looking at his code, you suggest the problem is happening because he did not include the _____ when referencing the variable.

Agnes has been using XQuery to design queries using path expressions. Her next project will involve multiple source documents and require more complicated criteria. She has heard that a FLWOR structure could be effective for such cases, and comes to you for assistance in developing a FLWOR structure query. -Agnes is confused by the rules about how many of each type of clause are required in a FLWOR structure. You tell her that in a FLWOR structure, there must be exactly only one _____ clause.

-The FLWOR structure needs to be enclosed within a set of _____ so that the XQuery processor evaluates the expression before writing the query result into its containing element.

In an XQuery file, the _____ namespace is used for creating user-defined functions.

-In the user-defined functions shown in the accompanying figure, the box labeled _____ indicates a function parameter.

You can add an element to a query through a(n) _____, which uses XML-like syntax to insert the element markup tags directly into the query expression.

-In the user-defined functions shown in the accompanying figure, the box labeled _____ indicates the data type returned by the function.

-In a FLWOR query structure, variables defined in the for clause update their value at each step in the iteration, but a variable defined in the _____ clause has a single unchanged value.

Alfonso has been working with XQuery, and would like to create a library module to centralize the global variables and functions he's created. He has encountered some problems in implementing the library module, and comes to you for help. -Alfonso has fixed the errors found in the variable references contained in his new query module, but is still encountering errors. In looking at his code, you remind him to add a(n) _____ to the query prolog.

Agnes has been using XQuery to design queries using path expressions. Her next project will involve multiple source documents and require more complicated criteria. She has heard that a FLWOR structure could be effective for such cases, and comes to you for assistance in developing a FLWOR structure query. -Agnes is confused by the rules about how many of each type of clause are required in a FLWOR structure. You tell her that in a FLWOR structure, the _____ clause is optional.

A(n) query function contains a collection of statements that can be referenced throughout the query document.

A query _____ contains a collection of statements that can be referenced throughout the query document.

Element values are enclosed within a set of square brackets .

-In the FLWOR query shown in the accompanying figure, the box labeled _____ indicates the root element.