XML

Accessing data using XPATH in a XML file

2008-04-09T00:06:00.000-07:00

We can learn 2 different ways of creating document object (getXmlParser() , getXmlParsers() ) and accessing the data from xml file using XPATH.

Error.xml
<?xml version="1.0" encoding="UTF-8"?>
<EXCEPTION_ROOT>
<EXCEPTION CODE="BENEF_1000">
<EXCEPTION_MESSAGE>
Beneficiary is not saved
</EXCEPTION_MESSAGE>
</EXCEPTION>
<EXCEPTION CODE="BENEF_1001">
<EXCEPTION_MESSAGE>
No records found
</EXCEPTION_MESSAGE>
</EXCEPTION>
</EXCEPTION_ROOT>

Error.xml
import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.apache.xerces.parsers.DOMParser;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.w3c.dom.Document;

public class Error {

private static Document doc;
private static DOMParser objDOMParser = null;
private static String fileName = "Error.xml";

public static void main(String[] args){

Error err1 = new Error();
err1.getXmlParsers();

err1.getSQLQuery("BENEF_1000");

Error err2 = new Error();
err2.getXmlParser();

err2.getSQLQuery("BENEF_1001");
}
public void getXmlParsers() {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

try {
DocumentBuilder builder = factory.newDocumentBuilder();
InputStream objInputStream = this.getClass().getResourceAsStream(fileName);
doc = builder.parse(objInputStream);
}catch(ParserConfigurationException parserException) {
}catch(SAXException saxException) {
}catch(IOException ioException) {
}catch(Exception exception){}
}
public void getXmlParser() {
try {
InputStream is = this.getClass().getResourceAsStream(fileName);
org.xml.sax.InputSource isrc = new org.xml.sax.InputSource(is);
objDOMParser = new DOMParser();
objDOMParser.parse(isrc);
doc = objDOMParser.getDocument();
} catch (Exception e) {
System.err.println(e);
}
}

public static void getSQLQuery(String queryName) {
String errorMessage = null;
try{
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
String expression ="EXCEPTION_ROOT/EXCEPTION[@CODE='"+queryName+"']/EXCEPTION_MESSAGE/text()";
XPathExpression expr = xpath.compile(expression);
NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
errorMessage = nodes.item(0).getNodeValue();
System.out.println(errorMessage);
}
catch(Exception ex) {
ex.printStackTrace();
System.out.println("......Error while parsing.....");
}
}
}

Accessing an XML document to retrieve attribute values

2008-02-17T05:38:00.000-08:00

Requirement:

We have an XML file with a element and couple of attributes in it. We need to parse the XML file and retrieve only the attribute values.

XML File (ABCSQLQueries):

<ABCQUERIES
TBUUSLIST_QUERY="SELECT TBUISUSKEY,TBUISUSNAME FROM OWN_ABC.TBUISUSLABELS"
AVAILABLEWITH_QUERY="SELECT A.REQUESTAVAILABLEKEY, A.DISPLAY FROM OWN_ABC.REQUESTAVAILABLE A, OWN_ABC.REQUESTDETAILS
B WHERE B.REQUESTDETAILSKEY = ? AND A.REQUESTAVAILABLEKEY = B.REQUESTAVAILABLEKEY"
/>

Code:

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.xml.sax.SAXException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Attr;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.DOMException;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

public class XmlReading {

Document doc;
Element element;
private static String fileName = "ABCSQLQueries.xml";

public static void main(String[] args) {
XmlReading xr = new XmlReading();
// xr.getXmlParser();
xr.getXmlParser(args);
}

public void getXmlParser() {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

try {
DocumentBuilder builder = factory.newDocumentBuilder();
InputStream objInputStream = this.getClass().getResourceAsStream(fileName);
doc = builder.parse(objInputStream);
}catch(ParserConfigurationException parserException) {
}catch(SAXException saxException) {
}catch(IOException ioException) {
}catch(Exception exception){}

getAttributes();
}

public void getXmlParser(String[] args) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

if(args.length != 1) {
System.err.println("XML File Required");
}

try {
DocumentBuilder builder = factory.newDocumentBuilder();
doc = builder.parse(new File(args[0]));
}catch(ParserConfigurationException e1) {
}catch(SAXException e2) {
}catch(IOException e3) {
}
getAttributes();
}

public void getAttributes() {

// Retrive the entire Document from the Dom Tree
element = doc.getDocumentElement();
// Retrive the attribute list from document
NamedNodeMap attrs = element.getAttributes();

// Get number of attributes in the element
int numAttrs = attrs.getLength();
System.out.println("\n Number of Attribute: " + numAttrs + "\n");

// Process each attribute

for (int i=0; i<numAttrs; i++) {
Node node = attrs.item(i);
// Get attribute name and value
String attrName = node.getNodeName();
String attrValue = node.getNodeValue();
System.out.println("Attribute Name: " + attrName + "\nAttribute Value: " + attrValue + "\n");
}

}
}

XML parsing has been done in both ways like user can give the XML file as input through console as well as hard-code the XML file name directly in the parsing java file.

Accessing an XML document to retrieve element values

2008-02-17T05:37:00.000-08:00

Requirement:

We have an XML file with couple of elements wrapped in a parent element. We need to parse the XML file and retrieve only the child element values.

XML File (ABCSQLQueries):

<ABCQUERIES>
<TBUUSLIST_QUERY>
SELECT TBUISUSKEY,TBUISUSNAME FROM OWN_ABC.TBUISUSLABELS
</TBUUSLIST_QUERY>
<AVAILABLEWITH_QUERY>
SELECT A.REQUESTAVAILABLEKEY, A.DISPLAY FROM OWN_ ABC.REQUESTAVAILABLE A, OWN_ ABC.REQUESTDETAILS B WHERE B.REQUESTDETAILSKEY = ? AND A.REQUESTAVAILABLEKEY = B.REQUESTAVAILABLEKEY
</AVAILABLEWITH_QUERY>
</ABCQUERIES>

Code:

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Attr;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.DOMException;

import org.xml.sax.SAXException;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

public class XmlReading {

Document doc;
Element element;
private static String fileName = "ABCSQLQueries.xml";

public static void main(String[] args) {
XmlReading xr = new XmlReading();
xr.getXmlParser();
// xr.getXmlParser(args);
}

public void getXmlParser() {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

try {
DocumentBuilder builder = factory.newDocumentBuilder();
InputStream objInputStream = this.getClass().getResourceAsStream(fileName);
doc = builder.parse(objInputStream);
}catch(ParserConfigurationException parserException) {
}catch(SAXException saxException) {
}catch(IOException ioException) {
}catch(Exception exception){}

getAttributes();
}

public void getXmlParser(String[] args) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

if(args.length != 1) {
System.err.println("XML File Required");
}

try {
DocumentBuilder builder = factory.newDocumentBuilder();
doc = builder.parse(new File(args[0]));
}catch(ParserConfigurationException e1) {
}catch(SAXException e2) {
}catch(IOException e3) {
}
getAttributes();
}

public void getAttributes() {

// Retrive the entire Document from the Dom Tree
element = doc.getDocumentElement();
String s1 = element.getTagName();
System.out.println("\nRoot Tag Name: " + s1);

// To get all the elements in a DOM Tree
NodeList nl1 = element.getElementsByTagName("*");
int i2 = nl1.getLength();
System.out.println("No of Elements: " + i2 + "\n");
for(int i=0; i<i2; i++) {
Node node = nl1.item(i);

System.out.println("Node Name: " + node.getNodeName());
System.out.println("Node Value: " + node.getFirstChild().getNodeValue());
}

}
}

XML parsing has been done in both ways like user can give the XML file as input through console as well as hard-code the XML file name directly in the parsing java file.

Accessing an XML document using DOM

2008-02-17T05:34:00.000-08:00

Requirement:
We have a completely organized XML file with SQL Queries. We need to parse the XML file and retrieve only the SQL Queries based on module code and sql query id.

XML File (ABCSQLQueries):

<SQL_ROOT>
<MODULE CODE="REQUEST">
<SQL_SEQMENT ID="PAYMENTTERMS_QUERY">
SELECT A.PAYMENTTERMSKEY, A.DISPLAY FROM OWN_ABC.PAYMENTTERMS A, OWN_ABC.REQUESTDETAILS B WHERE
B.REQUESTDETAILSKEY = ? AND A.PAYMENTTERMSKEY = B.PAYMENTTERMSKEY
</SQL_SEQMENT>
<SQL_SEQMENT ID="REQUEST_UPDATE">
update request query
</SQL_SEQMENT>
</MODULE>
<MODULE CODE="BANK">
<SQL_SEQMENT ID="BANK_SELECT">
Select bank query
</SQL_SEQMENT>
<SQL_SEQMENT ID="BANK_UPDATE">
update bank query
</SQL_SEQMENT>
</MODULE>
<MODULE CODE="COUNTRY">
<SQL_SEQMENT ID="COUNTRY_SELECT">
Select country query
</SQL_SEQMENT>
<SQL_SEQMENT ID="COUNTRY_UPDATE">
update country query
</SQL_SEQMENT>
</MODULE>
</SQL_ROOT>

Code:

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Attr;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.DOMException;

import org.xml.sax.SAXException;

import java.io.InputStream;
import java.io.IOException;

public class XMLParsing {

static Document doc;
static Element element;
private static String fileName = "ABCSQLQueries.xml";

public static void main(String[] args) {
XMLParsing xr = new XMLParsing();
xr.getXmlParser();
}

public void getXmlParser() {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

try {
DocumentBuilder builder = factory.newDocumentBuilder();
InputStream is = this.getClass().getResourceAsStream(fileName);
doc = builder.parse(is);
}catch(ParserConfigurationException parserException) {
}catch(SAXException saxException) {
}catch(IOException ioException) {
}catch(Exception exception){}
getElements("REQUEST", "PAYMENTTERMS_QUERY");
}

public static String getElements(String moduleName, String queryName) {

String gtemQuery = null;
// Retrive the entire Document from the Dom Tree
element = doc.getDocumentElement();
String s1 = element.getTagName();
System.out.println("\nRoot Tag Name: " + s1);

NodeList parentNodeList = element.getElementsByTagName("MODULE");

for(int parentNode = 0; parentNode < parentNodeList.getLength(); parentNode++) {
Node queryNode = parentNodeList.item(parentNode);

String attributeValue = getAttributes(queryNode);

if(queryNode.getNodeName().equals("MODULE") && attributeValue.equals(moduleName)) {

NodeList childNodeList = queryNode.getChildNodes();

for(int i=0; i<childNodeList.getLength(); i++) {
String childAttributeValue = null;

Node childNode = childNodeList.item(i);

if(childNode.getNodeType() == Node.ELEMENT_NODE){
childAttributeValue = getAttributes(childNode);

if(childAttributeValue.trim().equals(queryName)){
System.out.println("Query: " + childNode.getTextContent().trim());
gtemQuery = childNode.getTextContent().trim();
break;
}
}
}
}
}
return gtemQuery;
}

public static String getAttributes(Node firstLevelNode) {

String attributeValue = null;

NamedNodeMap nodeMap = firstLevelNode.getAttributes();

for (int i=0; i<nodeMap.getLength(); i++) {
Node attributeNode = nodeMap.item(i);
// Get attribute value
attributeValue = attributeNode.getNodeValue();
System.out.println("Attribute Value: " + attributeValue );
}
return attributeValue;
}

}

Accessing an XML document using XPATH

2008-02-17T05:31:00.000-08:00

Requirement:
We have a completely organized XML file with SQL Queries. We need to parse the XML file and retrieve only the SQL Queries based on module code and sql query id.

XML File (ABCSQLQueries):

<SQL_ROOT>
<MODULE CODE="REQUEST">
<SQL_SEQMENT ID="PAYMENTTERMS_QUERY">
SELECT A.PAYMENTTERMSKEY, A.DISPLAY FROM OWN_ABC.PAYMENTTERMS A, OWN_ABC.REQUESTDETAILS B WHERE
B.REQUESTDETAILSKEY = ? AND A.PAYMENTTERMSKEY = B.PAYMENTTERMSKEY
</SQL_SEQMENT>
<SQL_SEQMENT ID="REQUEST_UPDATE">
update request query
</SQL_SEQMENT>
</MODULE>
<MODULE CODE="BANK">
<SQL_SEQMENT ID="BANK_SELECT">
Select bank query
</SQL_SEQMENT>
<SQL_SEQMENT ID="BANK_UPDATE">
update bank query
</SQL_SEQMENT>
</MODULE>
<MODULE CODE="COUNTRY">
<SQL_SEQMENT ID="COUNTRY_SELECT">
Select country query
</SQL_SEQMENT>
<SQL_SEQMENT ID="COUNTRY_UPDATE">
update country query
</SQL_SEQMENT>
</MODULE>
</SQL_ROOT>

Code:

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

public class ABCSQLLoader {

static Document doc;
static Element element;
// Declare it in constants file and use it instead of hard-coding like this
private static String fileName = "ABCSQLQueries.xml";

Uncomment only for execution through console mode.
/*
public static void main(String[] args) {
XMLParser xr = new XMLParser();
xr.getXmlParser();
}
*/

public void getXmlParser() {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

try {
DocumentBuilder builder = factory.newDocumentBuilder();
InputStream objInputStream = this.getClass().getResourceAsStream(fileName);
doc = builder.parse(objInputStream);
}catch(ParserConfigurationException parserException) {
}catch(SAXException saxException) {
}catch(IOException ioException) {
}catch(Exception exception){}

Uncomment only for execution through console mode.
//getSQLQuery("REQUEST", "PAYMENTTERMS_QUERY");
}

public static String getSQLQuery (String moduleName, String queryName) {
String sqlQuery = null;
try{
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
String expression ="SQL_ROOT/MODULE[@CODE='"+moduleName+"']/SQL_SEQMENT[@ID='"+queryName+"']/text()";
XPathExpression expr = xpath.compile(expression);
NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
sqlQuery = nodes.item(0).getNodeValue();
System.out.println("Query: " + sqlQuery);
}
catch(Exception ex) {
System.out.println("......Error while parsing.....");
}
return sqlQuery;
}
}

How to apply this whole XML-SQL concept in a J2EE application?

Step-I: Load the XMLParser (ABCSQLLoader) while the J2EE web application starts in the server through a servlet’s init method.

public class PopulateApplicationDataServlet extends HttpServlet {

public void init(ServletConfig config) throws ServletException {
XMLParser parsing = new XMLParser();
parsing.getXmlParser();

}
}

Step-II:
Once the xml parser parse’s the XML file, give the module name and query name as parameters through normal java method call from the application DAO classes.

objResultSet = objStatement.executeQuery(ABCSQLLoader.getSQLQuery(
"REQUEST", " PAYMENTTERMS_QUERY "));

XQuery Tutorial

2006-04-24T22:45:00.000-07:00

XQuery Tutorial

How to restrict null values in XML tags

2006-03-29T01:44:00.000-08:00

The following declartion will restrict the tag values to only a to z, A to Z and 1 to 9 and no other values can be entered into it.

<element name="first">
<simpleType>
<restriction base="string">
<pattern value="([a-zA-Z1-9])+"/>
</restriction>
</simpleType>
</element>

XML Document To Schema

2006-03-28T20:52:00.000-08:00

The following article, "Validation by Instance", explores how one can translate an XML document into a Document Type Definition (DTD), a RELAX NG schema, and then into an W3C XML Schema (WXS) schema.

You can also use Stylus Studio Professional Edition (or) Stylus Studio Enterprise Edition XML Editor which integrates

XML instance Document to XML Schema
XML instance Document to DTD Schema

Articles

2006-03-27T22:58:00.000-08:00

Here is a list of articles by Deepak Vohra.

XPath

2006-03-27T22:48:00.000-08:00

Here is a XPath Tutorial from OnJava.com by Deepak Vohra.

XML Book

2006-03-27T22:33:00.000-08:00

Processing XML with Java by Elliotte Rusty Harold

API [DOM, SAX, JAXP] Parsers[Crimson, Xerces] - How to relate all these

2006-03-27T22:21:00.000-08:00

Here is a link from Processing XML with Java by Elliotte Rusty Harold which explains clearly about all the details of

1. What a parser is
2. what are the different API's with which you can access XML Document
3. What are the different parsers available to parse an XML Document

JAXP(SAX & DOM) vs JAXB

2006-03-27T02:38:00.000-08:00

Find the discussion about it here

Web Services Acronyms

2006-03-26T23:59:00.000-08:00

Here is a list of acronyms used in Web Services.

XML: Extensible Markup Language
SOAP: Simple Object Access Protocol
UDDI: Universal Description, Discovery and Integration
ebXML: Electronic Business Extensible Markup Language
WSDL: Web Services Description Language
JAXM: Java API for XML Messaging
JAX-RPC: Java API for Remote Procedure Call
JAXR: Java API for XML Registry
JAXP: Java API for XML Processing
JAXB: Java Architecture for XML Binding
SAAJ: SOAP with Attachments API for JavaJava
WSDP: Java Web Services Developer Pack
WS-I: Web Services Interoperability Organization
W3C: World Wide Web Consortium
OASIS: Organization for the Advancement of Structured Information Standards
JCP: Java Community Process

Java Architecture for XML Binding(JAXB)

2006-03-26T23:09:00.000-08:00

JAXB Basic Tutorial

What is JAXB.

About JAXB.

JAXB API

JAXB FAQ

XML - Java Mapping Tools

2006-03-26T22:36:00.000-08:00

Best practices for creating java classes from xml schema (.xsd)

1. Apache XMLBeans
2. (Java Architecture for XML Binding)JAXB/JaxMe

XML files to a Javabean

There are many tools out there which can be used to get the work done.

1. Jakarta Commons Digester.
2. Castor
3. XStream

While convert XML to Java objects when do you prefer Digestor over JAXB?

You can learn all about it here

Whats the difference in getElementsByTagName(String str)

2006-03-24T21:23:00.000-08:00

Whats the difference between

getElementsByTagName(String str) of Document object and
getElementsByTagName(String str) of Element object.

Sample XML Document.

<scenariotemplate>
   <layout name="intro,quest,conc" width ="1" height="3">
      <textElement name="Introduction" position="1"></textElement>
      <listElement name="Questions" position="2"></listElement>
      <textElement name="Conclusion" position="3"></textElement>
   </layout>
</scenariotemplate>

A sample Program:

Document doc = null;
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();

try {
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
doc = docBuilder.parse(new File("component.xml"));
}catch(ParserConfigurationException e1) {
}catch(SAXException e2) {
}catch(IOException e3) {
}

/* Scenario I */
Element RootElement = doc.getDocumentElement();
NodeList templates = RootElement.getElementsByTagName("*");

/* Scenario II */
NodeList templates = doc.getElementsByTagName("*");

int totaltemplates = templates.getLength();
System.out.println("Total no of child elements : " + totaltemplates);

In Scenario I - OUTPUT will be
Total no of child elements : 4
This is excluding the ROOT element.

In Scenario II - OUTPUT will be
Total no of child elements : 5
This is including the ROOT element.

XML Certification Worth?

2006-03-23T01:36:00.000-08:00

XML Certification is worth for future.

SAX Tutorial

2006-03-23T01:28:00.000-08:00

SAX - IBM Tutorial.

SAX Tutorial - DeveloperLife.com - Nazmul Idris

XML Introduction

2006-03-17T03:01:00.000-08:00

XML Introduction - from XML Evangelist, IBM

How to specify an attribute for a child element.

2006-03-15T02:32:00.000-08:00

Attribute declarations for child Elements in XML Schema

XML Tip

2006-03-15T02:27:00.000-08:00

An element cannot contain both simpleType as well as complexType. If you use both then you end up will the following error

The content of an element information item does not match (annotation?, (simpleType | complexType)?, (unique | key | keyref)*)

XML Schema Tutorial

2006-03-14T22:59:00.000-08:00

XML.com - XML Schema Tutorial

Here is link to a problem and relevant solution for Schema definition.

DOM Parser

2006-03-12T22:52:00.000-08:00

Here is a link that discuss about the advantages and disadvantages of DOM parser.

Local elements and targetNamespace

2006-03-09T03:19:00.000-08:00

XML Schema

?xml version="1.0"?>
xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://atw.co.in/vis" xmlns:tars="http://atw.co.in/vis"
>

xs:attributeGroup name="Agroup">
xs:attribute name="title" type="xs:string" />
/xs:attributeGroup>

xs:complexType name="NameType" >
xs:sequence>
xs:element name="first" type="xs:string" default="Hi"/>
xs:element name="last" type="xs:string" default="nu"/>
/xs:sequence>
xs:attributeGroup ref="tars:Agroup" />
/xs:complexType>

xs:element name="name" type="tars:NameType"/>
/xs:schema>

XML Document

?xml version="1.0"?>
vis:name
xmlns:vis="http://atw.co.in/vis"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://atw.co.in/vis name2.xsd"
title="Mr.">
vis:first>
vis:last>
/vis:name>

Error:

Element 'first' should be un-qualified
Element 'last' should be un-qualified

Reason for Error:

Look at your XML Schema document and the schema element. elementFormDefault attribute is missing. Hence, this attribute takes the default value, which is unqualified. Because of that, the local elements are not in the targetNamespace.

How to recify these errors?

Replace

-------------------------
vis:first>
vis:last>
--------------------------

With

-------------------------
first>
last>
--------------------------

OR include
elementFormDefault attribute with "qualified" value in schema element.

XML Schema

?xml version="1.0"?>
xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://atw.co.in/vis" xmlns:tars="http://atw.co.in/vis"
elementFormDefault="qualified">

Why do the local elements do not come under targetNamespace when their parent element is?

That's by definition of the XML Schema recommentations.

XML Namespaces FAQ

2006-03-09T02:33:00.000-08:00

Here you go

XML Namespaces FAQ

Here is another link that has discussion about namespaces.

Element Type - Declaration

2006-03-09T01:18:00.000-08:00

I have an XML document, with one structure nested inside another - e.g "manager" element nested inside a "company":

code:


company>
manager>
name> john /name>
/manager>
/company>

I'm trying to create a schema (xsd) for this.
Note my "manager" needs to be defined outside the scope of "company", so that it's re-usable (i.e. manager may be nested inside other structures, not just "company").

I get the impression there are 2 ways to do it:

1. Define "manager" as *element*, then let "company" declare a *ref* to it

code:


schema ...>
element name="company">
complexType>
sequence>
element ref="manager"/>
/sequence>
/complexType>
/element>
element name="manager">
complexType>
sequence>
element name="name" type="string"/>
/sequence>
/complexType>
/element>
/schema>

2. Define "manager" as *complex type*

code:


schema ...>
element name="company">
complexType>
sequence>
element name="manager" type="managerType"/>
/sequence>
/complexType>
/element>
complexType name="managerType">
sequence>
element name="name" type="string"/>
/sequence>
/complexType>
/schema>

Could anyone please tell what's the difference between the 2 approaches ? Why does XML define 2 syntaxes to achieve the same goal ?

Answer:

First XSD(Schema) is called Using a global Type.
Second XSD(Schema) is called Referring to a existing global element.

Using a global Type:
Often many of our elements will have the same content. Instead of declaring duplicate local types throughout our schema, we can create a global type. Within our element declarations, we can refer to a global type by name (with type attribute).

Referring to a existing global element:
Referring to global types allows us to easily reuse content model definitions within our XML Schema. Often, we may want to reuse a particular element delcaration, instead of the type. XML Schemas allow you reuse global element declarations within your content model.

Check this link for better understanding.

XML Resources

2006-02-27T21:47:00.000-08:00

A collection of good websites that provides useful links and articles about XML technologies.

XML.com

www.w3schools.com

www.zvon.org

XML IDE's

2006-02-27T21:22:00.000-08:00

Excellent IDE's for XML development that helps developers to develop xml application at an incredible speed. This tool has lot of modern features that supports latest versions of advanced XML concepts like XPath, XQuery, XSLT and others.

A must have tool for XML developers.

Xml IDE - stylusstudio.com

Product:
Stylus Studio 2006 XML Enterprise Edition.
Stylus Studio 2006 XML Professional Edition.
Stylus Studio 2006 XML Home Edition.

Xml IDE - altova.com

Product:
XMLSpy Enterprise Edition - XML development environment

IBM XML Exam Study Material

2006-01-10T00:53:00.000-08:00

IBM XML (Exam - 141) - Objectives

XML Exam Experience- Ranch 1

XML Exam Experience- Ranch 2

XML Exam Experience- Ranch 3

XML Exam Experience- Ranch 4

Ranch - 5

Ranch - Exam Links

Notes by Hari Vignesh Padmanaban.

Assesment Test:
No need to take any paid assesment test. Follow the link given in javaranch, which has an assessment test.

Assessment Test Taking

Pre-Assessment Test(with answer).

Pre-Assessment Test (Without Answer).

DTDs for web.xml and tld

2005-12-14T20:51:00.000-08:00

Check it here

Where XML should be used.

2005-11-18T02:50:00.000-08:00

All about Xml