Example 5-1. Including elements from the input document
Query
for $prod in doc("catalog.xml")/catalog/product[@dept = 'ACC']return $prod/name
Results
<name language="en">Floppy Sun Hat</name><name language="en">Deluxe Travel Bag</name>
Example 5-2. Including complex elements from the input document
Query
for $prod in doc("catalog.xml")/catalog/product[@dept = 'ACC']return $prod
Results
<product dept="ACC"> <number>563</number> <name language="en">Floppy Sun Hat</name></product><product dept="ACC"> <number>443</number> <name language="en">Deluxe Travel Bag</name></product>
Example 5-3. Constructing elements using XML-like syntax
Query
<html> <h1>Product Catalog</h1> <ul>{ for $prod in doc("catalog.xml")/catalog/product return <li>number: {data($prod/number)}, name: {data($prod/name)}</li> }</ul></html>
Results
<html> <h1>Product Catalog</h1> <ul> <li>number: 557, name: Fleece Pullover</li> <li>number: 563, name: Floppy Sun Hat</li> <li>number: 443, name: Deluxe Travel Bag</li> <li>number: 784, name: Cotton Dress Shirt</li> </ul></html>
Example 5-4. Embedded direct element constructors
Query
<html> <h1>Product Catalog</h1> <p>A <i>huge</i> list of {count(doc("catalog.xml")//product)} products.</p></html>
Results
<html> <h1>Product Catalog</h1> <p>A <i>huge</i> list of 4 products.</p></html>
Example 5-5. Enclosed expressions that evaluate to elements
Query
for $prod in doc("catalog.xml")/catalog/productreturn <li>number: {$prod/number}</li>
Results
<li>number: <number>557</number></li><li>number: <number>563</number></li><li>number: <number>443</number></li><li>number: <number>784</number></li>
Example 5-6. Enclosed expressions that evaluate to attributes
Query
for $prod in doc("catalog.xml")/catalog/productreturn <li>{$prod/@dept}number: {$prod/number}</li>
Results
<li dept="WMN">number: <number>557</number></li><li dept="ACC">number: <number>563</number></li><li dept="ACC">number: <number>443</number></li><li dept="MEN">number: <number>784</number></li>
Example 5-7. Enclosed expressions with multiple sub-expressions
Query
for $prod in doc("catalog.xml")/catalog/productreturn <li>{$prod/@dept, "string", 5+3, $prod/number}</li>
Results
<li dept="WMN">string 8<number>557</number></li><li dept="ACC">string 8<number>563</number></li><li dept="ACC">string 8<number>443</number></li><li dept="MEN">string 8<number>784</number></li>
Example 5-8. Specifying attributes directly using XML-like syntax
Query
<html> <h1 class="itemHdr">Product Catalog</h1> <ul>{ for $prod in doc("catalog.xml")/catalog/product return <li dep="{$prod/@dept}">number: {data($prod/number) }, name: {data($prod/name)}</li> }</ul></html>
Results
<html> <h1 class="itemHdr">Product Catalog</h1> <ul> <li dep="WMN">number: 557, name: Fleece Pullover</li> <li dep="ACC">number: 563, name: Floppy Sun Hat</li> <li dep="ACC">number: 443, name: Deluxe Travel Bag</li> <li dep="MEN">number: 784, name: Cotton Dress Shirt</li> </ul></html>
Example 5-9. Using a namespace declaration in a constructor
Query
<xhtml:html xmlns:xhtml="http://www.w3.org/1999/xhtml"> <xhtml:h1 class="itemHdr">Product Catalog</xhtml:h1> <xhtml:ul>{ for $prod in doc("catalog.xml")/catalog/product return <xhtml:li class="{$prod/@dept}">number: { data($prod/number)}</xhtml:li> }</xhtml:ul></xhtml:html>
Results
<xhtml:html xmlns:xhtml="http://www.w3.org/1999/xhtml"> <xhtml:h1 class="itemHdr">Product Catalog</xhtml:h1> <xhtml:ul> <xhtml:li class="WMN">number: 557</xhtml:li> <xhtml:li class="ACC">number: 563</xhtml:li> <xhtml:li class="ACC">number: 443</xhtml:li> <xhtml:li class="MEN">number: 784</xhtml:li> </xhtml:ul></xhtml:html>
Example 5-10. Adding an attribute to an element
Query
for $prod in doc("catalog.xml")/catalog/product[@dept = 'ACC']return <product id="P{$prod/number}"> {$prod/(@*, *)} </product>
Results
<product dept="ACC" id="P563"> <number>563</number> <name language="en">Floppy Sun Hat</name></product><product dept="ACC" id="P443"> <number>443</number> <name language="en">Deluxe Travel Bag</name></product>
Example 5-11. Removing a child from an element
Query
for $prod in doc("catalog.xml")/catalog/product[@dept = 'ACC']return <product> {$prod/(@*, * except number)} </product>
Results
<product dept="ACC"> <name language="en">Floppy Sun Hat</name></product><product dept="ACC"> <name language="en">Deluxe Travel Bag</name></product>
Example 5-12. Constructor with boundary whitespace
<ul> { <li> <b> number:</b> { "557" } </li> }</ul>
Example 5-13. Simple computed constructor
Query
element html { element h1 { "Product Catalog" }, element ul { for $prod in doc("catalog.xml")/catalog/product return element li {"number:", data($prod/number), ", name:", data($prod/name)} }}
Results
<html> <h1>Product Catalog</h1> <ul> <li>number: 557 , name: Fleece Pullover</li> <li>number: 563 , name: Floppy Sun Hat</li> <li>number: 443 , name: Deluxe Travel Bag</li> <li>number: 784 , name: Cotton Dress Shirt</li> </ul></html>
Example 5-14. Turning content into markup
Query
for $dept in distinct-values(doc("catalog.xml")/catalog/product/@dept)return element {$dept} {doc("catalog.xml")/catalog/product[@dept = $dept]/name}
Results
<WMN> <name language="en">Fleece Pullover</name></WMN><ACC> <name language="en">Floppy Sun Hat</name> <name language="en">Deluxe Travel Bag</name></ACC><MEN> <name language="en">Cotton Dress Shirt</name></MEN>