Jaxb : Binding XML Schemas

This section describes the default XML-to-Java bindings used by JAXB. All of these bindings can be overridden on global or case-by-case levels by means of a custom binding declaration.

Simple Type Definitions

A schema component using a simple type definition typically binds to a Java property. Since there are different kinds of such schema components, the following Java property attributes (common to the schema components) include:

• Base type
• Collection type, if any
• Predicate

The rest of the java property attributes are specified in schema component using simple type definition.

Default Data Type Bindings

The Java language provides a richer set of data type than XML schema.

XML Schema Type	Java Data Type
xsd:string	java.lang.String
xsd:integer	java.math.BigInteger
xsd:int	int
xsd.long	long
xsd:short	short
xsd:decimal	java.math.BigDecimal
xsd:float	float
xsd:double	double
xsd:boolean	boolean
xsd:byte	byte
xsd:QName	javax.xml.namespace.QName
xsd:dateTime	java.util.Calendar
xsd:base64Binary	byte[]
xsd:hexBinary	byte[]
xsd:unsignedInt	long
xsd:unsignedShort	int
xsd:unsignedByte	short
xsd:time	java.util.Calendar
xsd:date	java.util.Calendar
xsd:anySimpleType	java.lang.String

Default Binding Rules

The JAXB binding model follows the default binding rules summarized below:

From	To
XML Namespace URI	Java package
Named complex type	Java content interface
Anonymous inlined type definition of an element declaration	Java content interface
A named simple type definition with a basetype that derives from "xsd:NCName" and has enumeration facet	enum class
A global element declaration to a Element interface	Java Element interface
Local element declaration that can be inserted into a general content list	Java Element interface
Attribute	Java property