How To Write An Xml Document In Java (Java) (Java.Com) (For Free) (Programming) (Web) (Permanent) (Powerpoint) (Networking) (Html) (Procedure) (Lang

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1 XML and Java The Extensible Markup Language

2 XML makes data portable Anders Møller & Michael I. Schwartzbach 2006 Addison-Wesley Underpinning for Web Related Computing fits well to Java, which makes code portable a standard for data interchange Java API s for XML processing: An Introduction to XML and Web Technologies What is XML?! XML: Extensible Markup Language! A framework for defining markup languages! Each language is targeted at its own application domain with its own markup tags! There is a common set of generic tools for processing XML documents! XHTML: an XML variant of HTML! Inherently internationalized and platform independent (Unicode)! Developed by W3C, standardized in JAXP, SAX, DOM, XSLT, JAXB, JAX-RPC, SAAJ, JAXR

3 XML languages an application of the XML standard, which defines a vocabulary with symbols, semantics, and rules

4 Some XML Languages (1) XHTML XML Hypertext Markup Language an HTML version that adheres to the XML standard XLINK XML-based standard for hypertext links XSLT XML Stylesheet Language for Transformation SOAP, WSDL are are used for Web Services

5 Some XML Languages (2) XML schema: a description of the type of an XML document (syntax and semantics) XPATH: a query language for selecting nodes from an XML document RDF: Resource Description Framework a language to define metadata models (entity-relationship, class diagrams) XMI: a standard to exchange meta-data information via XML MOF: a language to define meta-models DTD: Document Type Definition (like XML schema)

6 XML Structure <preparat i on> Tag-oriented representation of data 5 like HTML but Building tags on the XML identify Notation the data HTML-tags! Showing recipe tell documents how in browsers to display data <t i t l e>rhubarb Cobb l er< / t i t l e> <da te>wed, 14 Jun 95< / da t e> < i ngred i ent name="d i ced rhubarb" amount="2. 5" un i t="cup" / > < i ngred i ent name=" sugar " amount="2" un i t=" t ab l espoon" / > < i ngred i ent name=" f a i r l y r i pe banana" amount="2" / > < i ngred i ent name="c i nnamon" amount="0. 25" un i t=" teaspoon" / > < i ngred i ent name="nutmeg" amount="1" un i t="dash" / > <s t ep> Comb i ne a l l and use as cobb l er, p i e, or cr i sp. < / s tep> < / prepara t i on> An Introduction to XML and Web Technologies! Defining the syntax of our recipe language DTD, XML Schema,... XPath, XSLT! Recipe collections as databases XQuery! Building a Web-based recipe editor HTTP, Servlets, JSP,... Example:!... Coffee price list the topics of the following weeks... <PRICELIST> <COFFEE> An Introduction to XML and Web Technologies <NAME>MOCHA JAVA</NAME> <PRICE>11.95</PRICE> </COFFEE> <COFFEE> <NAME>SUMATRA</NAME> <PRICE>12.50</PRICE> </COFFEE> </PRICELIST> 7 <nut r i t i on ca l or i es="170" f a t="28%" carbohydrates="58%" prot e i n="14%" / > <re l a ted re f ="42">Garden Qu i che i s a l so yummy< / re l ated> < / rec i pe> < / co l l ect i on> An Introduction to XML and Web Technologies An Introduction to XML and Web Technologies XML Trees! Conceptually, an XML document is a tree structure node, edge root, leaf child, parent sibling (ordered), ancestor, descendant An Introduction to XML and Web Technologies An Introduction to XML and Web Technologies An Analogy: File Systems Nodes in XML Trees! Text nodes: carry the actual contents, leaf nodes! Element nodes: define hierarchical logical groupings of contents, each have a name! Attribute nodes: unordered, each associated with an element node, has a name and a value! Comment nodes: ignorable meta-information! Processing instructions: instructions to specific processors, each have a target and a value! Root nodes: every XML tree has one root node that represents the entire tree

7 xample Well-formedness od i ng=" I SO "?> Tags EM "examp l e. d td"> i n f orma t i on spec i f i c to my too l?> arçon! t a t ag> ] ] > to spec i f y the encod i ng - - > written in parentheses <... >! Every XML document must be well-formed start and end tags must match and nest properly <x><y></y></x> " </z><x><y></x></y> exactly one root element...! in other words, it defines a proper tree structure any tag <x> must have a matching end tag </x> 15! XML parser: given the textual XML document, constructs its tree representation An Introduction to XML and Web Technologies 16 between is the definition of an element of XML data tags can contain tags (are nested) Note: XML element names are case-sensitive!

8 Tag Attributes Tags can contain attributes additional information included as part of the tag itself: ATTRIBUTE <message subject="xml Is Really Cool"> <text> How many ways is XML cool? Let me count the ways... </text> </message> ATTRIBUTES ARE FOLLOWED BY AN = SIGN AND SEPARATED BY SPACES

9 Comments XML comments look just like HTML comments: <MESSAGE " " SUBJECT="XML IS REALLY COOL"> <!-- THIS IS A COMMENT --> s in XML Trees <TEXT> HOW MANY WAYS IS XML COOL? LET ME " " COUNT THE WAYS... define hierarchical </TEXT> logical </MESSAGE> y the actual contents, leaf nodes ents, each have a name unordered, each associated ode, has a name and a value : ignorable meta-information uctions: instructions to specific have a target and a value ry XML tree has one root node e Freitag, entire 31. Mai tree 13 9 An Introduction to XML and Web Technologies 1 Textual Representation! Text nodes: written as the text they carry! Element nodes: start-end tags <bla...>... < / bla> short-hand notation for empty elements: <bla / >! Attribute nodes: name= value in start tags! Comment nodes: <! - - bla - - >! Processing instructions: <?target value?>! Root nodes: implicit

10 The XML Prolog XML files allways starts with a prolog minimum: <?xml version="1.0"?>..or with additional information: <?XML VERSION="1.0" ENCODING="ISO " STANDALONE="YES"?> VERSION IDENTIFIES THE VERSION OF THE XML MARKUP LANGUAGE USED IN THE DATA. THIS ATTRIBUTE IS NOT OPTIONAL. ENCODING IDENTIFIES THE CHARACTER SET USED TO ENCODE THE DATA. "ISO " IS "LATIN-1" THE WESTERN EUROPEAN AND ENGLISH LANGUAGE CHARACTER SET. (THE DEFAULT IS COMPRESSED UNICODE: UTF-8.) STANDALONE TELLS WHETHER OR NOT THIS DOCUMENT REFERENCES AN EXTERNAL ENTITY OR AN EXTERNAL DATA TYPE SPECIFICATION (SEE LATER). IF THERE ARE NO EXTERNAL REFERENCES, THEN "YES" IS APPROPRIATE

11 Character Encoding Schemes US-ASCII is a 7-bit encoding scheme that covers the English-language alphabet. It is not large enough to cover the characters used in other languages, however, so it is not very useful for internationalization. ISO is the character set for Western European languages. It's an 8-bit encoding scheme in which every encoded character takes exactly 8-bits. (With the remaining character sets, on the other hand, some codes are reserved to signal the start of a multibyte character.) UTF-8 is an 8-bit encoding scheme. Characters from the English-language alphabet are all encoded using an 8-bit bytes. Characters for other languages are encoded using 2, 3 or even 4 bytes. UTF-8 therefore produces compact documents for the English language, but for other languages, documents tend to be half again as large as they would be if they used UTF-16. If the majority of a document's text is in a Western European language, then UTF-8 is generally a good choice because it allows for internationalization while still minimizing the space required for encoding. UTF-16 is a 16-bit encoding scheme. It is large enough to encode all the characters from all the alphabets in the world. It uses 16-bits for most characters, but includes 32-bit characters for ideogram-based languages like Chinese. A Western European-language document that uses UTF-16 will be twice as large as the same document encoded using UTF-8. But documents written in far Eastern languages will be far smaller using UTF-16.

12 XML Benefits formatted xml display in a modern Webbrowsers plain text, can easily be debugged identifies data by readable tags is stylable: When display is important, the stylesheet standard, XSL, lets you dictate how to portray the data. For example, the stylesheet for: <to>you@youraddress.com</to> can say: 1. START A NEW LINE. 2. DISPLAY "TO:" IN BOLD, FOLLOWED BY A SPACE 3. DISPLAY THE DESTINATION DATA. WHICH PRODUCES: TO: YOU@YOURADDRESS

13 XML tags must make sense Simpler Alternatives? S-expressions, 1958: to Applications multiple applications to use the same XML must agree upon tag names example: XML file for a messaging application (e.g. ) <MESSAGE> <TO>YOU@YOURADDRESS.COM</TO> <FROM>ME@MYADDRESS.COM</FROM> <SUBJECT>XML IS REALLY COOL</SUBJECT> <TEXT> HOW MANY WAYS IS XML COOL? LET ME COUNT THE WAYS... </TEXT> </MESSAGE> ( co l l ec t i on ( rec i pe ( t i t l e "Rhubarb Cobb l er " ) (da te "Wed, 14 Jun 95" )... ) )! XML is defined as a simplified subset of SGML! XML could have been designed simpler...!... but it wasn t [end of discussion] An Introduction to XML and Web Technologies XHTML: an XML variant of HTML makes sense to modern Example: Web XHTML browsers <?xm l ver s i on="1. 0" encod i ng="utf - 8"?> <htm l xm l ns="ht tp : / / www. w3. org / 1999 / xhtm l "> <head><t i t l e>he l l o wor l d! < / t i t l e>< / head> <body> <h1>th i s i s a head i ng< / h1> Th i s i s some t ex t. < / body> < / htm l > An Introduction to XML and Web Technologies 17 19

14 XML is extensible in contrast to HTML, XML allows you to write your own tags allowed tags in a document can be described in a schema describes hierarchical structure and order of tags SCHEMA LANGUAGES: " DOCUMENT TYPE " DEFINITION (DTD) "NEWER IS XML " SCHEMA BY W3C

15 Example of a DTD <!ELEMENT pricelist (coffee)+> <!ELEMENT coffee (name, price) > <!ELEMENT name (#PCDATA) > <!ELEMENT price (#PCDATA) > The first line in the example gives the highest level element, pricelist, which means that all the other tags in the document will come between the <pricelist> and </pricelist> tags. The first line also says that the pricelist element must contain one or more coffee elements (indicated by the plus sign). The second line specifies that each coffee element must contain both a name element and a price element, in that order. The third and fourth lines specify that the data between the tags <name> and </name> and between <price> and </price> is character data that should be parsed. The name and price of each coffee are the actual text that makes up the price list.

16 Schemas ensure Portability Parsers can validate XML documents using a Schema humans can read XML documents, but tag names by themself have no meaning to applications applications must agree on the meaning of the tags

17 XML is Everywhere examples of use on this computer this presentation an Apple Keynote document preferences of Mac OS X applications see preferences of the Dock in /Users/korte/ Library/Preferences/com.apple.dock.plist

18 Apple Dock: Preference File

19 XML and Web Services 8&/9!&':%-&+9;+1*&9<=1>#$& common language for.%+,'%/",)' information interchange between services and clients!"##$%&' 70( 62,&'2&, 70( 70( ()*%+,%-+ 70( 012"31-,"'%2* 41-%$%,5 defining Web services operations!"#$%&'()'**+),$#)-)./-'+-#+)0&(1/%*&(1/)&',#-./#23/2#*) ),$#)+-/-)*431-'(*)&')*562.&'*..)-770&3-/&$'.89)) i.e. Web Services require parsing and processing XML documents Java provides vendor-neutral APIs!"

20 JAVA API s for XML document-oriented Java API for XML Processing (JAXP) -- processes XML documents using various parsers Java Architecture for XML Binding (JAXB) -- processes XML documents using schema-derived JavaBeans component classes SOAP with Attachments API for Java (SAAJ) -- sends SOAP messages over the Internet in a standard way procedure-oriented Java API for XML-based RPC (JAX-RPC) -- sends SOAP method calls to remote parties over the Internet and receives the results - now replaced by JAX-WS Java API for XML Registries (JAXR) -- provides a standard way to access business registries and share information

21 JAXP - Java API for XML Processing 42 contains: SAX API - Simple API for XML parser processes XML document line by line and and notifies an application by calling methods from the ContentHandler Interface J2EE: The Integrated Platform for Web Services SAX: encountering an XML element while parsing is an event that triggers the invocation of an event handler XML Document Input SAX Parser Creates Events Event Handlers SAX: easy, sequential processing with small memory footprint XML Document Input DOM Parser Creates Tree

22 Summary of SAX APIs (1) SAXParserFactory A SAXParserFactory object creates an instance of the parser determined by the system property, javax.xml.parsers.saxparserfactory. SAXParser The SAXParser interface defines several kinds of 112 parse() methods. In general, you pass an XML data source and a DefaultHandler object to the parser, which processes the XML and invokes the appropriate methods in the handler object. Java API documentation: look into package javax.xml.parsers Note: well known software design patterns are used here SAXReader The SAXParser wraps a SAXReader. It is the SAXReader which carries on the conversation with the SAX event handlers you define. DefaultHandler Not shown in the diagram, a DefaultHandler implements the ContentHandler, ErrorHandler, DTDHandler, and EntityResolver interfaces (with null methods), so you can override only the ones you're interested in. Figure 4 1 SAX APIs

23 Summary of SAX APIs (2) ContentHandler 112 Methods like startdocument, enddocument, startelement, and endelement are invoked when an XML tag is recognized. This interface also defines methods characters and processinginstruction, which are invoked when the parser encounters the text in an XML element or an inline processing instruction, respectively. ErrorHandler Methods error, fatalerror, and warning are invoked in response to various parsing errors. DTDHandler Defines methods you will generally never be called upon to use. Used when processing a DTD to recognize and act on declarations for an unparsed entity. EntityResolver The resolveentity method is invoked when the parser must identify data identified by a URI. In most cases, a URI is simply a URL, which specifies the location of a document, but in some cases the document may be identified by a URN - a public identifier, or name, that is unique in the Web space. The public identifier may be specified in addition to the URL. The EntityResolver can then use the public identifier instead of the URL to find the document, for example to access a local copy of the document if one exists. Figure 4 1 SAX APIs The parser wraps a SAXReader object. When the parser s pa invoked, the reader invokes one of several callback methods im application. Those methods are defined by the interfaces C ErrorHandler, DTDHandler, and EntityResolver. Here is a summary of the key SAX APIs: SAXParserFactory A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the urn scheme, and does not imply SAXParser availability of the identified resource. Both URNs (names) and URLs (locators) are URIs, and some URI may be a name and a locator at the same time. A SAXParserFactory object creates an instance of the pars the system property, javax.xml.parsers.saxparserfact The SAXParser interface defines several kinds of parse() eral, you pass an XML data source and a DefaultHandl parser, which processes the XML and invokes the appropria handler object. SAXReader The SAXParser wraps a SAXReader. Typically, you don t ca

24 About Design Patterns... provide solutions for common design problems decorator singleton factory method observer Here are some basics

25 Decorator augments the functionality of an object decorator object wraps another object decorator has a similar interface calls are related to the wrapped object... but the decorator can provide additional functionality example: java.io.bufferedreader wraps a class to adapt its interface to specific needs wraps and augments an unbuffered Reader object

26 Singleton? ensures only a single instance of a class exists all clients use the same object constructor is private to prevent external instantiation single instance optained via a static getinstance method GIVE AN EXAMPLE!

27 Factory Method a pattern for object creation client require an object of a particular interface or superclass type see: Sun - Designing Web Services with J2EE chapter 2: plattechs.pdf p. 41 a factory method is free to return an implementing-class object or subclass object exact type depends on context example: SAXParserFactory.newInstance() method of the following example adds flexibility by not calling a constructor which would return a fixed implementation

28 Observer supports separation of internal model from a view of that model observer defines a one to many relationship between objects the object observed informs notifies all observers of any state change the SAX parser (observable) notifies the ContentHandler (observer) whenever it encounters an XML tag register example: the saxparser.parse( new File(argv[0]), handler) call of the following example Observer notify Observable

29 import java.io.*; import org.xml.sax.*; import org.xml.sax.helpers.defaulthandler; import javax.xml.parsers.saxparserfactory; import javax.xml.parsers.parserconfigurationexception; import javax.xml.parsers.saxparser; public class Echo01 extends DefaultHandler { StringBuffer textbuffer; public static void main(string argv[]) { if (argv.length!= 1) { System.err.println("Usage: cmd filename"); System.exit(1); } This example is described in the J2EE 1.4 Tutorial page 123ff: Echoing an XML File with the SAX Parser. part (1) // Use an instance of ourselves as the SAX event handler DefaultHandler handler = new Echo01(); // Use the default (non-validating) parser SAXParserFactory factory = SAXParserFactory.newInstance(); try { // Set up output stream out = new OutputStreamWriter(System.out, "UTF8"); // Parse the input SAXParser saxparser = factory.newsaxparser(); saxparser.parse( new File(argv[0]), handler); } } catch (Throwable t) { t.printstacktrace(); } System.exit(0); static private Writer out;

30 } static private Writer out; //=========================================================== // SAX DocumentHandler methods //=========================================================== public void startdocument() throws SAXException { emit("<?xml version='1.0' encoding='utf-8'?>"); nl(); } public void enddocument() throws SAXException { try { nl(); out.flush(); } catch (IOException e) { throw new SAXException("I/O error", e); } } This example is described in the J2EE 1.4 Tutorial page 123ff: Echoing an XML File with the SAX Parser. part (2) public void startelement(string namespaceuri, String sname, // simple name String qname, // qualified name Attributes attrs) throws SAXException { echotext(); String ename = sname; // element name if ("".equals(ename)) ename = qname; // not namespaceaware emit("<"+ename); if (attrs!= null) { for (int i = 0; i < attrs.getlength(); i++) { String aname = attrs.getlocalname(i); // Attr name if ("".equals(aname)) aname = attrs.getqname(i); emit(" "); emit(aname+"=\""+attrs.getvalue(i)+"\""); } } emit(">"); Freitag, } 31. Mai 13

31 } public void startelement(string namespaceuri, String sname, // simple name String qname, // qualified name Attributes attrs) throws SAXException { echotext(); String ename = sname; // element name if ("".equals(ename)) ename = qname; // not namespaceaware emit("<"+ename); if (attrs!= null) { for (int i = 0; i < attrs.getlength(); i++) { String aname = attrs.getlocalname(i); // Attr name if ("".equals(aname)) aname = attrs.getqname(i); emit(" "); emit(aname+"=\""+attrs.getvalue(i)+"\""); } } emit(">"); } public void endelement(string namespaceuri, String sname, // simple name String qname // qualified name ) throws SAXException { echotext(); String ename = sname; // element name if ("".equals(ename)) ename = qname; // not namespaceaware emit("</"+ename+">"); } public void characters(char buf[], int offset, int len) throws SAXException { String s = new String(buf, offset, len); if (textbuffer == null) { textbuffer = new StringBuffer(s); } else { textbuffer.append(s); } } This example is described in the J2EE 1.4 Tutorial page 123ff: Echoing an XML File with the SAX Parser. part (3) Echo01.java Printed: Freitag, 12. Mai :14:07 Uhr } } } //=========================================================== // Utility Methods... //=========================================================== // Display text accumulated in the character buffer private void echotext() throws SAXException { if (textbuffer == null) return; String s = ""+textbuffer; emit(s); textbuffer = null; } // Wrap I/O exceptions in SAX exceptions, to // suit handler signature requirements private void emit(string s) throws SAXException { try { out.write(s); out.flush(); } catch (IOException e) { throw new SAXException("I/O error", e); } } // Start a new line private void nl() throws SAXException { String lineend = System.getProperty("line.separator"); try { out.write(lineend); } catch (IOException e) { throw new SAXException("I/O error", e); } }

32 SAX Example PARSER CALLBACKS: <pricelist> [parser calls startelement] <coffee> [parser calls startelement] <name>mocha Java</name> [parser calls startelement, characters, and endelement] <price>11.95</price> [parser calls startelement, characters, and endelement] </coffee> [parser calls endelement] JAVA SOURCE CODE: SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser saxparser = factory.newsaxparser(); saxparser.parse("pricelist.xml", handler);

33 The DOM API Document Object Model defined by the W3C builds an object representation in the form of a tree of a parsed XML document in memory 42 allows for the manipulation of an XML document XML Document Input J2EE: The Integrated Platform for Web Services SAX Parser Creates Events Event Handlers insert and remove elements XML Document Input DOM Parser Creates Tree Figure 2.5 SAX- and DOM-Based XML Parser APIs

34 DOM API Example (1) add Kona Coffee to pricelist read XML into DOM: <pricelist> <coffee> <name>mocha Java</name> <price>11.95</price> </coffee> <coffee> <name>sumatra</name> <price>12.50</price> </coffee> </pricelist> DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newdocumentbuilder(); Document document = builder.parse("pricelist.xml");

35 Node rootnode = document.getdocumentelement(); NodeList list = document.getelementsbytagname("coffee"); // Loop through the list. for (int i=0; i < list.getlength(); i++) { thiscoffeenode = list.item(i); Node thisnamenode = thiscoffeenode.getfirstchild(); if (thisnamenode == null) continue; if (thisnamenode.getfirstchild() == null) continue; if (! thisnamenode.getfirstchild() instanceof org.w3c.dom.text) continue; String data = thisnamenode.getfirstchild().getnodevalue(); if (! data.equals("mocha Java")) continue; //We're at the Mocha Java node. Create and insert the new //element. Node newcoffeenode = document.createelement("coffee"); Node newnamenode = document.createelement("name"); Text tnnode = document.createtextnode("kona"); newnamenode.appendchild(tnnode); <pricelist> <coffee> <name>mocha Java</name> <price>11.95</price> </coffee> <coffee> <name>sumatra</name> <price>12.50</price> </coffee> </pricelist> insert Kona after Mocha Java } Node newpricenode = document.createelement("price"); Text tpnode = document.createtextnode("13.50"); newpricenode.appendchild(tpnode); newcoffeenode.appendchild(newnamenode); newcoffeenode.appendchild(newpricenode); rootnode.insertbefore(newcoffeenode, thiscoffeenode); break; Lab exercise: analyse and run the DOMecho example in the jaxp subdirectory of the J2EE Tutorial Examples

36 XML Namespaces if an XML document references multiple schemas or DTDs use namespaces declaring an XML Namespace is usually done in the root element of an XML document. In the following namespace declaration, the notation xmlns identifies nsname as a namespace, and nsname is set to the URL of the actual namespace: <pricelist xmlns:nsname="mydtd.dtd" xmlns:othernsname="myotherdtd.dtd">... </pricelist> Within the document, you can specify which namespace an element belongs to as follows: <nsname:price>..

37 XSLT API XML Stylesheet Language for Tranformations (XSLT) defined by the W3C describes a language to transform XML documents into other formats e.g. XML, HTML, Text, uses a stylesheet to perform the transformation written in the XML stylesheet language XSL

38 XSLT Transformation Process a TransformerFactory object is created used to create a Transformer object a source object can be created from a SAX reader, from a DOM, or from an input stream

39 <?xml version="1.0" encoding="iso "?> <xsl:stylesheet xmlns:xsl=" version="1.0" > <xsl:output method="html"/> <xsl:template match="/"> <html><body> <xsl:apply-templates/> </body></html> </xsl:template> The Stylesheet Language <xsl:template match="/article/title"> <h1 align="center"> <xsl:apply-templates/> </h1> </xsl:template> <!-- Top Level Heading --> <xsl:template match="/article/sect"> <h2> <xsl:apply-templates select="text() B I U DEF LINK"/> </h2> <xsl:apply-templates select="sect PARA LIST NOTE"/> </xsl:template> example of a.xsl file used to convert to html <!-- Second-Level Heading --> <xsl:template match="/article/sect/sect"> <h3> <xsl:apply-templates select="text() B I U DEF LINK"/> </h3> <xsl:apply-templates select="sect PARA LIST NOTE"/> </xsl:template> <!-- Paragraph --> <xsl:template match="para"> <p><xsl:apply-templates/></p> </xsl:template> </xsl:stylesheet>

40 JAXB - Java Architecture for XML Binding can be used to generate Java classes from XML schemas provides methods for unmarshaling an XML document into a Java objects and vice versa eases XML data processing for Java programmers

41 The JAXB Binding Process

42 SAAJ SOAP with Attachments API for JAVA XML messaging for the Java platform used mainly for SOAP messaging behind the scenes of JAX-WS and JAXR (API for XML Registries)

43 XML messages SOAP message with or without attachments attachment part can contain any content

44 Java API for XML Registries (JAXR) to access standard business registries over the internet open standards: ebxml sponsored by OASIS (Organization for the Advancement of Structured Information Standards) industry consortium-led: UDDI

45 JAXR Architecture JAXR client uses JAXR API JAXR provider implements the JAXR API for a specific registry type

46 Getting Access to a Registry There are no more public registries available!

47 Querying a Registry use the methods of the BusinessQueryManager interface findorganizations returns a list of organizations that meet the search criteria findservices returns a set of services offered findservicebindings returns informations on how to access a service

48 Classification Schemes standard classification schemes The North American Industry Classification System (NAICS). See for details. The Universal Standard Products and Services Classification (UNSPSC). See for details. The ISO 3166 country codes classification system maintained by the International Organization for Standardization (ISO). See iso3166ma/index.html for details.