XQueries and XPaths

Question 1

what does FLWOR stand for

Answer 1

for
let
where
order by
return

Question 2

structure of a for clause

Answer 2

FOR IN , ….

Question 3

what do variables start with

Answer 3

$

Question 4

structure for a let clause

Answer 4

LET := , ….

Question 5

what are curly brackets used for in x queries

Answer 5

to indicate that the expression enclosed needs to be evaluated by the x query processor

Question 6

what is the where clause used in conjunction with

Answer 6

for

Question 7

what does the where clause do

Answer 7

filters the binding tuples produced by the for and let clause

Question 8

how to order the return values

Answer 8

order by

Question 9

what is a union

Answer 9

contains all nodes that occur in ether of the operands

Question 10

what is the intersect operands

Answer 10

produces a sequence containing all the nodes that occur in both operands

Question 11

what is except operands

Answer 11

produces a sequence containig all the nodes that occur in its first operand but not the second

Question 12

in an if clause, what three statements are needed

Answer 12

if
then
else

Question 13

what is the some expression

Answer 13

returns true if the test expression is true for some variable binding

Question 14

what is the every expression

Answer 14

returns true if the test expression is true for every variable binding

Question 15

example of built in functions

Answer 15

string-join
name() returns name of node
data() gets whats inside the node
distinct-values() removes duplicates

Question 16

general format of a user defined X query function

Answer 16

declare function local:function_Name(list parameters)
{
function body
};

Question 17

how to call a user defined function

Answer 17

{local:function_Name(Parameters)}

Question 18

how to declare types in user defined functions

Answer 18

xs:type

eg xs:integer

xs:string