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XQuery Sequences

XQuery Sequences represent an ordered collection of elements where the elements can be of similar or of different types.

Creating a sequence​

An XQuery sequence is created using parentheses with strings inside quotation marks or double quotes or numbers. XML elements can also be used as elements of a sequence.

Items of a sequence can be iterated one by one, using index or by value.

For example:

let $items := ('orange', <apple/>, <fruit type="juicy"/>, <vehicle type="car">sentro</vehicle>, 1,2,3,'a','b',"abc")
let $count := count($items)
return
<result>
   <count>{$count}</count>
   
   <items>
      {
	     for $item in $items
         return <item>{$item}</item>
      }
   </items>
</result>

Obtaining the following result:

<result>
   <count>10</count>
   <items>
      <item>orange</item>
      <item>
         <apple/>
      </item>
      <item>
         <fruit type="juicy"/>
      </item>
      <item>
         <vehicle type="car">Sentro</vehicle>
      </item>
      <item>1</item>
      <item>2</item>
      <item>3</item>
      <item>a</item>
      <item>b</item>
      <item>abc</item>
   </items>
</result>

Viewing the Items of a Sequence​

Items of a sequence can be iterated one by one, using index or by value.

By Index​

let $items := (1,2,3,4,5,6)
let $count := count($items)
return
   <result>
      <count>{$count}</count>
      <items>
      {
         for $item in $items[2]
         return <item>{$item}</item>
      }
      </items>
   </result>

Output:

<result>
   <count>6</count>
   <items>
      <item>2</item>
   </items>
</result>

By Value​

let $items := (1,2,3,4,5,6)
let $count := count($items)
return
   <result>
      <count>{$count}</count>
      <items>
      {
         for $item in $items[. = (1,2,3)]
         return <item>{$item}</item>
      }
      </items>
   </result>

Output:

<result>
   <count>6</count>
   <items>
      <item>1</item>
      <item>2</item>
      <item>3</item>
   </items>
</result>

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