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simple, exible, text-based markup language. XML data is marked using tags enclosed in angled
brackets. The tags contain the meaning of the data they mark. Such markup allows dierent
systems to easily exchange data with each other.
A Document Type Denition (DTD) or XML Schema Denition (XSD) describes the structure
of an XML document. It has information on the tags the corresponding XML document can
have, the order of those tags, and so forth.
XSLT, which stands for eXtensible Stylesheet Language Transformation, is used for
transforming XML documents from one format to another.
Web Services Standards
Simple Object Access Protocol (SOAP) provides a common messaging format for web services.
SOAP enables objects not known to one another to exchange messages. SOAP uses an
XML-based data encoding format and HTTP to transport messages. SOAP is independent of
both the programming language and the operational platform, and it does not require any
specic technology at its endpoints
Universal Description, Discovery, and Integration (UDDI) provides a standard way to register,
de-register, and look up web services. Similar to a telephone system's yellow pages, a UDDI
registry's enables providers to register their services and requestors to nd services. Once a
requestor nds a service, the registry has no more role to play between the requestor and the
provider.
Web Services Description Language (WSDL) denes a standard way to specify the details of a
web service. It is a general-purpose XML schema that can species details of web service
interfaces, bindings, and other deployment details. By having such a standard way to specify
details of a service, clients who have no prior knowledge of a web service can use it.
ebXML (Electronic Business using eXtensible Markup Language) is a set of specications that
enables enterprises to conduct business over the Internet.
OASIS (Organization for the
Advancement of Structured Information Standards) controls the ebXML specications.
Java EE Web Service Standards
Java APIs for XML processing (JAXP) is a vendor-neutral set of lightweight APIs for parsing or
processing XML documents. JAXP enables a web service to “plug in” any conforming XML
parser. If no external parser is “plugged in,” then JAXP uses its own XML parser
implementation.
Java API for XML-based remote procedure calls (JAX-RPC) uses an XML-based protocol for
client-server remote procedure calls . JAX-RPC enables SOAP-based interoperable and portable
web services. Developers use the JAX-RPC programming model to develop SOAP-based web
Overview ofWebServices
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