Chapter 10: Namespaces and XQuery

Example 10-1. Namespace declarations

<cat:catalog xmlns:cat="http://datypic.com/cat"
             xmlns:prod="http://datypic.com/prod">
  <cat:number>1446</cat:number>
  <prod:product>
    <prod:number>563</prod:number>
    <prod:name prod:language="en">Floppy Sun Hat</prod:name>
  </prod:product>
</cat:catalog>

Example 10-2. Alternate prefixes

<foo:catalog xmlns:foo="http://datypic.com/cat"
           xmlns:bar="http://datypic.com/prod">
  <foo:number>1446</foo:number>
  <bar:product>
    <bar:number>563</bar:number>
    <bar:name bar:language="en">Floppy Sun Hat</bar:name>
  </bar:product>
</foo:catalog>

Example 10-3. Namespaces and attributes

<product xmlns="http://datypic.com/prod"
         xmlns:app="http://datypic.com/app"
         app:id="P123" dept="ACC">
...
</product>

Example 10-4. Namespace declarations and scope (cat_ns.xml)

<catalog xmlns="http://datypic.com/cat">
  <number>1446</number>
  <prod:product xmlns:prod="http://datypic.com/prod">
    <prod:number>563</prod:number>
    <prod:name language="en">Floppy Sun Hat</prod:name>
  </prod:product>
</catalog>

Example 10-5. Overriding the default namespace

<catalog xmlns="http://datypic.com/cat">
  <number>1446</number>
  <product xmlns="http://datypic.com/prod">
    <number>563</number>
    <name language="en">Floppy Sun Hat</name>
  </product>
</catalog>

Example 10-6. Prolog namespace declarations

declare namespace rep = "http://datypic.com/report";
declare namespace prod = "http://datypic.com/prod";
<rep:report> {
  doc("cat_ns.xml")//prod:product
} </rep:report>

Example 10-7. Prolog default namespace declaration

declare default element namespace "http://datypic.com/cat";
declare namespace rep = "http://datypic.com/report";
declare namespace prod = "http://datypic.com/prod";
<rep:report> {
  doc("cat_ns.xml")/catalog/prod:product
} </rep:report>

Example 10-8. Namespace declarations in query different from input document

declare namespace rep = "http://datypic.com/report";
declare namespace cat = "http://datypic.com/cat";
declare namespace prod2 = "http://datypic.com/prod";
<rep:report> {
  doc("cat_ns.xml")/cat:catalog/prod2:product
} </rep:report>

Example 10-9. Using namespace declaration attributes

<rep:report xmlns="http://datypic.com/cat"
            xmlns:prod="http://datypic.com/prod"
            xmlns:rep="http://datypic.com/report"> {
  doc("cat_ns.xml")/catalog/prod:product
} </rep:report>

Example 10-10. Namespace declaration impact on input elements

<report xmlns="http://datypic.com/report">
  <firstChild/>
  {doc("prod_ns.xml")/*}
</report>

Example 10-11. Simple product example in namespace (prod_ns.xml)

<prod:product xmlns:prod="http://datypic.com/prod">
  <prod:number>563</prod:number>
  <prod:name language="en">Floppy Sun Hat</prod:name>
</prod:product>

Example 10-12. Using XML namespace declarations

<report xmlns="http://datypic.com/report"
             xmlns:cat="http://datypic.com/cat"
             xmlns:prod="http://datypic.com/prod"> {
  for $product in doc("prod_ns.xml")/prod:product
  return <lineItem>
           {$product/prod:number}
           {$product/prod:name}
         </lineItem>
} </report>

Example 10-13. Prolog namespace declarations

declare default element namespace "http://datypic.com/report";
declare namespace cat = "http://datypic.com/cat";
declare namespace prod = "http://datypic.com/prod";
<report> {
  for $product in doc("prod_ns.xml")/prod:product
  return <lineItem>
           {$product/prod:number}
           {$product/prod:name}
         </lineItem>
} </report>

Example 10-14. A balanced approach

declare namespace cat = "http://datypic.com/cat";
<report xmlns="http://datypic.com/report"
           xmlns:prod="http://datypic.com/prod"> {
  for $product in doc("prod_ns.xml")/prod:product
  return <lineItem>
           {$product/prod:number}
           {$product/prod:name}
         </lineItem>
} </report>

Example 10-15. Multi-namespace input document (cat_ns2.xml)

<cat:catalog xmlns:cat="http://datypic.com/cat"
         xmlns:prod="http://datypic.com/prod"
         xmlns:ord="http://datypic.com/ord">
  <prod:product>
    <prod:number>563</prod:number>
    <prod:name language="en">Floppy Sun Hat</prod:name>
  </prod:product>
</cat:catalog>

Example 10-16. Query with no-preserve, inherit

declare copy-namespaces no-preserve, inherit;
<report xmlns="http://datypic.com/report"
        xmlns:cat="http://datypic.com/cat"
        xmlns:prodnew="http://datypic.com/prod"> {
  doc("cat_ns2.xml")//prodnew:product
} </report>

Example 10-17. Query with preserve, no-inherit

declare copy-namespaces preserve, no-inherit;
<report xmlns="http://datypic.com/report"
           xmlns:cat="http://datypic.com/cat"
           xmlns:prodnew="http://datypic.com/prod"> {
  doc("cat_ns2.xml")//prodnew:product
} </report>