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Binding XML Schemas

This section describes the default XML-to-Java bindings used by JAXB. All of thesebindings can be overridden on global or case-by-case levels by means of acustom binding declaration. See theJAXB Specification for complete information about the default JAXBbindings.

Simple Type Definitions

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

Base type
Collection type, if any
Predicate

The rest of the Java property attributes are specified in the schema componentusing thesimple type definition.

Default Data Type Bindings

The following sections explain the default schema-to-Java,JAXBElement, and Java-to-schema data typebindings.

Schema-to-Java Mapping

The Java language provides a richer set of data type than XMLschema.Table 17-1 lists the mapping of XML data types to Java data typesin JAXB.

Table 17-1 JAXB Mapping of XML Schema Built-in Data Types

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`	`javax.xml.datatype.XMLGregorianCalendar`
`xsd:base64Binary`	`byte[]`
`xsd:hexBinary`	`byte[]`
`xsd:unsignedInt`	`long`
`xsd:unsignedShort`	`int`
`xsd:unsignedByte`	`short`
`xsd:time`	`javax.xml.datatype.XMLGregorianCalendar`
`xsd:date`	`javax.xml.datatype.XMLGregorianCalendar`
`xsd:g`	`javax.xml.datatype.XMLGregorianCalendar`
`xsd:anySimpleType`	`java.lang.Object`
`xsd:anySimpleType`	`java.lang.String`
`xsd:duration`	`javax.xml.datatype.Duration`
`xsd:NOTATION`	`javax.xml.namespace.QName`

`JAXBElement` Object

When XML element information can not be inferred by the derived Java representationof the XML content, aJAXBElement object is provided. This object has methodsfor getting and setting the object name and object value.

Java-to-Schema Mapping

Table 17-2 shows the default mapping of Java classes to XML data types.

Table 17-2 JAXB Mapping of XML Data Types to Java Classes

Java Class	XMLData Type
`java.lang.String`	`xs:string`
`java.math.BigInteger`	`xs:integer`
`java.math.BigDecimal`	`xs:decimal`
`java.util.Calendar`	`xs:dateTime`
`java.util.Date`	`xs:dateTime`
`javax.xml.namespace.QName`	`xs:QName`
`java.net.URI`	`xs:string`
`javax.xml.datatype.XMLGregorianCalendar`	`xs:anySimpleType`
`javax.xml.datatype.Duration`	`xs:duration`
`java.lang.Object`	`xs:anyType`
`java.awt.Image`	`xs:base64Binary`
`javax.activation.DataHandler`	`xs:base64Binary`
`javax.xml.transform.Source`	`xs:base64Binary`
`java.util.UUID`	`xs:string`