Question 1

-The last statement in the FLWOR structure is always the _____ clause.
A) for
B) where
C) group by
D) return

Accepted Answer

The FLWOR expression in XQuery ends with the "return" clause, which specifies the output of the query.

Question 2

As with XSLT, many calculations and operations in XQuery can be performed using _____, in which the XQuery function calls itself repeatedly until a stopping condition is met.
A) recursion
B) looping
C) predicates
D) parameters

Accepted Answer

Recursion allows for repeated function calls until a stopping condition is met, making it useful for calculations and operations in XQuery. The other options, looping, predicates, and parameters, are also important in XQuery, but do not directly relate to repeated function calls.

Question 3

-You can use multiple _____ clauses in a FLWOR query structure to create nested sequences.
A) let
B) where
C) for
D) return

Accepted Answer

The for clause is used to create nested sequences in a FLWOR query structure.

Question 4

A(n) _____ module is an external XQuery file that contains only the declarations for namespaces, variables, and user-defined functions.
A) storage
B) library
C) import
D) declaration

Accepted Answer

A library module in XQuery is an external file that can be imported into a main XQuery file. It only contains declarations for namespaces, variables, and user-defined functions.

Question 5

-In the user-defined functions shown in the accompanying figure, the box labeled _____ indicates a function name.
A) A
B) B
C) C
D) D

Accepted Answer

The box labeled A typically indicates a function name in user-defined functions.

Question 6

-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.
A) let
B) where
C) group by
D) return

Accepted Answer

In a FLWOR query, the "let" clause is used to bind a variable to a value that does not change during the iteration, unlike the "for" clause where the variable updates with each iteration.

Question 7

Module library files are often saved with the file extension _____.
A) .xq
B) .xql
C) .xqm
D) .xml

Accepted Answer

The file extension for module library files is typically .xqm, which stands for "XQuery module." While .xq and .xql are occasionally used for XQuery files, they are not typically used for modules. .xml is a more general file extension for XML files and is not specific to XQuery.

Question 8

-In a FLWOR query structure, the _____ clause specifies a condition by which the items in the iterated sequence are filtered.
A) for
B) let
C) where
D) order by

Accepted Answer

The "where" clause in a FLWOR query is used to filter the items in the sequence based on a specified condition.

Question 9

When a query is based on elements in which there is no predefined set of unique values, you can construct a list of unique values using the XPath 2.0 _____ function.
A) distinct-values()
B) unique-values()
C) defined-values()
D) list-values()

Accepted Answer

The distinct-values() function is used in XPath to create a list of unique values based on elements that do not have a predefined set of unique values. It eliminates duplicates and returns only distinct values. Therefore, option A is the best choice. The other options (B, C, D) are not valid XPath 2.0 functions.

Question 10

A query _____ contains a collection of statements that can be referenced throughout the query document.
A) module
B) function
C) prolog
D) header

Accepted Answer

The answer of A query _____ contains a collection of...

Question 11

In XQuery, variables are assigned using the _____ symbol.
A) :=
B) =
C) ==
D) =:

Accepted Answer

In XQuery, variables are assigned using the := symbol.

Question 12

In a FLWOR query you can include the _____ keyword within the for clause to track the number of iterations.
A) at
B) count
C) track
D) iteration

Accepted Answer

The "at" keyword is used in a FLWOR expression within the "for" clause to keep track of the current iteration number.

Question 13

-In the user-defined functions shown in the accompanying figure, the box labeled _____ indicates a function parameter.
A) A
B) B
C) C
D) D

Accepted Answer

The answer of 
-In the user-defined functions shown in the...

Question 14

-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.
A) square brackets
B) curly braces
C) parentheses
D) double quotes

Accepted Answer

Curly braces are used in XQuery to enclose expressions that need to be evaluated before being inserted into the containing element.

Question 15

The _____ statement retrieves all of the variables and functions defined in a library module.
A) load
B) import
C) retrieve
D) library

Accepted Answer

The import statement is used to access functions and variables in modules. It allows you to import all of the definitions from another module into the current namespace. Therefore, option B is the best choice as it is the only one that fits the description. The load statement is not a valid python statement, retrieve is not a python keyword, and library is not a statement in python.

Question 16

When you import a library module, the module _____ in the import statement must match the one in the library module file.
A) namespace
B) prolog
C) template
D) URI

Accepted Answer

The answer of When you import a library module, the...

Question 17

One way to query data from several sources is to apply a _____ clause to each document source.
A) let
B) group by
C) for
D) return

Accepted Answer

The FOR clause is used to specify the document source for the query.

Question 18

-In a FLWOR query structure, the _____ clause sorts the items in the sequence based on a supplied expression.
A) for
B) let
C) where
D) order by

Accepted Answer

The "order by" clause in a FLWOR query is used to sort the items in the sequence based on a specified expression.

Question 19

-The first expression in a FLWOR query structure is the _____ clause.
A) for
B) let
C) where
D) return

Accepted Answer

The first expression in a FLWOR query structure is the "for" clause, which is used to iterate over a sequence of items.

Question 20

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

Accepted Answer

The box labeled C typically indicates the data type returned by the function in a user-defined function diagram.

Quiz 9: Working With Xml and Databases

-The last statement in the FLWOR structure is always the _____ clause.

As with XSLT, many calculations and operations in XQuery can be performed using _____, in which the XQuery function calls itself repeatedly until a stopping condition is met.

-You can use multiple _____ clauses in a FLWOR query structure to create nested sequences.

A(n) _____ module is an external XQuery file that contains only the declarations for namespaces, variables, and user-defined functions.

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

-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.

Module library files are often saved with the file extension _____.

-In a FLWOR query structure, the _____ clause specifies a condition by which the items in the iterated sequence are filtered.

When a query is based on elements in which there is no predefined set of unique values, you can construct a list of unique values using the XPath 2.0 _____ function.

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

In XQuery, variables are assigned using the _____ symbol.

In a FLWOR query you can include the _____ keyword within the for clause to track the number of iterations.

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

-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.

The _____ statement retrieves all of the variables and functions defined in a library module.

When you import a library module, the module _____ in the import statement must match the one in the library module file.

One way to query data from several sources is to apply a _____ clause to each document source.

-In a FLWOR query structure, the _____ clause sorts the items in the sequence based on a supplied expression.

-The first expression in a FLWOR query structure is the _____ clause.

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