Parsing, Creating, and Transforming XML Documents - Beginning Java 7 - page 925

<xs:element name="ingredients">
<xs:complexType>
<xs:sequence>
<xs:element ref="ingredient" maxOc-

curs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="ingredient">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute ref="qty"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>

After creating the schema, you'll want to reference it from a recipe document. Ac-
complishthistaskbyspecifying xmlns:xsi and xsi:schemaLocation attributes
on the document's root element start tag ( <recipe> ), as follows:
<recipe xmlns="http://www.tutortutor.ca/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-in-

stance"

xsi:schemaLocation="http://www.tutortutor.ca/
schemas recipe.xsd">
The xmlns attribute identifies http://www.tutortutor.ca/ as the docu-
ment's default namespace. Unprefixed elements and their unprefixed attributes belong
to this namespace.
The xmlns:xsi attributeassociatestheconventional xsi (XMLSchemaInstance)
prefix with the standard http://www.w3.org/2001/XMLSchema-instance
namespace. The only item in the document that's prefixed with xsi: is schem-
aLocation .
The schemaLocation attributeisusedtolocatetheschema.Thisattribute'svalue
canbemultiplepairsofspace-separatedvalues,butisspecifiedasasinglepairofsuch
valuesinthisexample.Thefirstvalue( http://www.tutortutor.ca/schemas )