devxlogo

Using the &lt< and &gt> XQuery Operators

Using the &lt< and &gt> XQuery Operators

When you want to determine the order of articles into an sequence returned by an XQuery query, you can use the << and >> operators:

    - X << Y: is true if X is before Y;    - X >> Y: is true if Y is before X;

For example, suppose you have the following sequence of strings:

Shark, Daisy, Hunter, Lego, Helly

Use this query:

let $xml:=doc(?file:///C://Data_Local//xml//AirWings.xml?)for $a in $xml/company/aircrafts  for $b in  $xml/company/aircrafts   return(if($a/type<<$b/type) then concat($a/type/@M,"--]",$b/type/@M) 	else concat($a/type/@M,"[--",$b/type/@M)   )

The query returns:

Shark[--Shark, Shark--]Daisy, Shark--]Hunter, Shark--]Lego,Shark--]Helly, Daisy[--Shark, Daisy[--Daisy, Daisy--]Hunter,Daisy--]Lego, Daisy--]Helly, Hunter[--Shark, Hunter[--Daisy,Hunter[--Hunter, Hunter--]Lego, Hunter--]Helly, Lego[--Shark,Lego[--Daisy, Lego[--Hunter, Lego[--Lego, Lego--]Helly ,Helly[--Shark, Helly[--Daisy, Helly[--Hunter, Helly[--Lego,Helly[--Helly
See also  5 Tips for Working With an Onsite Interpreter
devxblackblue

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist