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30.2. XML Namespace Mapping
Overview
XML Schema type, group, and element definitions are scoped using namespaces. The namespaces prevent possible naming clashes between entities that use the same name. Java packages serve a similar purpose. Therefore, Apache CXF maps the target namespace of a schema document into a package containing the classes necessary to implement the structures defined in the schema document.
Package naming
The name of the generated package is derived from a schema's target namespace using the following algorithm:
- The URI scheme, if present, is stripped.NoteApache CXF will only strip the http:, https:, and urn: schemes.For example, the namespace
http:\\www.widgetvendor.com\types\widgetTypes.xsdbecomes\\widgetvendor.com\types\widgetTypes.xsd. - The trailing file type identifier, if present, is stripped.For example,
\\www.widgetvendor.com\types\widgetTypes.xsdbecomes\\widgetvendor.com\types\widgetTypes. - The resulting string is broken into a list of strings using
/and:as separators.So,\\www.widgetvendor.com\types\widgetTypesbecomes the list{"www.widegetvendor.com", "types", "widgetTypes"}. - If the first string in the list is an internet domain name, it is decomposed as follows:
- The leading
www.is stripped. - The remaining string is split into its component parts using the
.as the separator. - The order of the list is reversed.
So,{"www.widegetvendor.com", "types", "widgetTypes"}becomes{"com", "widegetvendor", "types", "widgetTypes"}NoteInternet domain names end in one of the following:.com,.net,.edu,.org,.gov, or in one of the two-letter country codes. - The strings are converted into all lower case.So,
{"com", "widegetvendor", "types", "widgetTypes"}becomes{"com", "widegetvendor", "types", "widgettypes"}. - The strings are normalized into valid Java package name components as follows:
- If the strings contain any special characters, the special characters are converted to an underscore(
_). - If any of the strings are a Java keyword, the keyword is prefixed with an underscore(
_). - If any of the strings begin with a numeral, the string is prefixed with an underscore(
_).
- The strings are concatenated using
.as a separator.So,{"com", "widegetvendor", "types", "widgettypes"}becomes the package name com.widgetvendor.types.widgettypes.
The XML Schema constructs defined in the namespace
http:\\www.widgetvendor.com\types\widgetTypes.xsd are mapped to the Java package com.widgetvendor.types.widgettypes.
Package contents
A JAXB generated package contains the following:
- A class implementing each complex type defined in the schemaFor more information on complex type mapping see Chapter 33, Using Complex Types.
- An enum type for any simple types defined using the
enumerationfacetFor more information on how enumerations are mapped see Section 32.3, “Enumerations”. - A public
ObjectFactoryclass that contains methods for instantiating objects from the schemaFor more information on theObjectFactoryclass see Section 30.3, “The Object Factory”. - A
package-info.javafile that provides metadata about the classes in the package
