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Hi there, Iam preparing for IBM-XML cert. I like to work out some examples. May be it's a silly question :-( could u pls reply me what r all the parsers & tools i need,to run a XML program in a PC. I need a java based Parser!Plz help me with the links. thanks for ur time
MAIN TOPICS WE NEED TO CONCENTRATE UPON Remember �.. You need to verify the concepts with the help of tools (provided here) in order to understand them thoroughly. 1.General XML and DTDs � XML Bible has very good introduction to these concepts including in-depth coverage of entities and all that good stuff of DTDs. Testing tool http://msdn.microsoft.com/downloads/samples/internet/default.asp?url=/Downloads/samples/Internet/xml/xml_validator/Default.asp The above link has microsoft�s xml validator. I use this for validation of my xml instance documents against the DTDs. I think this can also be used to validate against schemas, but I never tried it. 2.Schemas � You need to get Roger Costello�s tutorial from the following location. It is simply the best available on the web. It has 3 ppt files on schemas. http://www.xfront.com/xml-schema.html Testing tool The xml schema validator XSV given here is provided on Roger Costello�s website given here � ftp://ftp.cogsci.ed.ac.uk/pub/XSV/XSV12.EXE This can be used to validate the xml documents against the schemas we write. 3.XSLT � One of the best tutorials available on the web for xslt is given below. The best part is that it explains things with examples. http://zvon.org/xxl/XSLTutorial/Output/contents.html Testing tool You need to have Xalan�s Java based XSLT processor and the following details you how to install that stuff on your m/cs (you need to have Java SDK1.2 or later). This takes care of 3 birds in one shot XSLT, DOM and SAX testing tools � http://xml.apache.org/xalan-j/ You will be applying the stylesheets to the xml files from the command line. The following are the sequence of steps i followed to get the stuff working on my m/c - 1) download xalan-j_2_4_0-bin.zip from the above site 2) extract the zip file in any of the directories 3) You then need to go to the xalan/bin directory and extract the contents of some of the jar files here as "jar -xvf xalan.jar", then the same thing for xercesImpl.jar and xml-apis.jar. This process will basically extract all the class files which will be used by the our xslt processor. 4) The most important thing then is to update the CLASSPATH variable on our m/c with the absolute path of our xalan/bin directory. 5) To ensure that everything is properly set up on ur m/c, you need to run the following command from the command line - java org.apache.xalan.xslt.Process and it should give you a list of options as shown below - ================================================= -IN inputXMLURL -XSL XSLTransformationURL -OUT outputFileName -V (Version info) -QC (Quiet Pattern Conflicts Warnings) -TT (Trace the templates as they are being called) -TG (Trace each result tree generation event) -TS (Trace each selection event) -TTC (Trace the template children as they are being processed) -EDUMP [optional]FileName (Do stackdump on error) -XML (Use XML formatter and add XML header) -TEXT (Use simple Text formatter) -HTML (Use HTML formatter) -PARAM name value (Set a stylesheet parameter) -DIAG (Print number of milliseconds transform operation took) -FLAVOR flavorName (Transform with SAX for s2s or DOM for d2d) -URIRESOLVER fullClassName (Use a custom URIResolver) -ENTITYRESOLVER fullClassName (Use a custom EntityResolver) -CONTENTHANDLER fullClassName (Use a custom ContentHandler) -INCREMENTAL (Request incremental transform by setting http://xml.apache.org/xalan/features/incremental to true) -NOOPTIMIZE (Request no optizimation of stylesheet processing by setting http://xml.apache.org/xalan/features/optimize to false) -RL recursionLimit (Set numeric limit on depht of stylesheet recursion) -L (Turn on source_location attribute) ================================================ This make sure that you are all set to go. If you didnot set the classpath stuff properly, you will get the no class defintion found error. Also one common mistake people do is forget to include the current directory �.� In their classpath. 6) Next thing is that you need to write a sample test.xml file (say) and write some xsl file for that (test.xsl) and run the command as follows - java org.apache.xalan.xslt.Process -in test.xml -xsl test.xsl -out test.txt You can find all these details at http://xml.apache.org/xalan-j/ Xpath and XSLT are inter-twined. We have a good tutorial for Xpath at the following location - http://www.oreilly.com/catalog/xmlnut/chapter/ch09.html 4.DOM - Java�s Xalan Xslt processor has all the DOM API implementation classes for java. Read the above procedure for installing the xalan processor carefully and this will set up the required things for DOM and SAX in java. The best way for understanding the DOM API in my opinion is try to practice one of its implementations. I�m following Java�s from the following website � http://java.sun.com/j2se/1.4.1/docs/guide/plugin/dom/org/w3c/dom/package-summary.html I�m giving you a small java program written using this DOM API to give you a head start to start working with this. Please go through the code thoroughly to understand the process. In a nutshell, I�m trying to walk through the DOM tree build by parsing the xml file �aa.xml�. You need to copy the following xml code in a file named aa.xml and the java code in a file named order.java. XML File to be parsed � <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE orders [ <!ELEMENT orders (order*)> <!ELEMENT order (customerid, status, item*)> <!ELEMENT item ANY> <!ELEMENT status (#PCDATA)> <!ELEMENT name (#PCDATA)> <!ELEMENT price (#PCDATA)> <!ELEMENT qty (#PCDATA)> <!ATTLIST customerid limit CDATA #REQUIRED> <!ATTLIST orders Notation ENTITY #IMPLIED> <!ATTLIST item instock CDATA #REQUIRED itemid CDATA #REQUIRED> <!ENTITY jaya "WB78"> <!ENTITY jayaTwo "&elementEntity;"> <!ELEMENT jaya (#PCDATA)> <!ENTITY elementEntity "<jaya>jayadev</jaya>"> <!NOTATION jaya SYSTEM "jaya.exe"> <!ENTITY giffile SYSTEM "demo.gif" NDATA jaya> ]> <?PI-1 this is first processing instruction?> <orders Notation="giffile"> <order> <?PI-2 this is second processing instruction?> <customerid limit="1000">12341</customerid> <status>pending</status> <item instock="Y" itemid="SA15"> <![CDATA[hi there]]> <name>Silver Show Saddle, 16 inch</name> <price>825.00</price> <qty>1</qty> </item> <item instock="N" itemid="C49"> <![CDATA[hi there]]> <name>Premium Cinch</name> <price>49.00</price> <qty>1</qty> </item> </order> <order> <?PI-3 this is third processing instruction?> <customerid limit="150">251222</customerid> <status>pending</status> <item instock="Y" itemid="&jaya;"> &jayaTwo; <!-- &giffile; --> <![CDATA[hi there]]> <name>Winter Blanket (78 inch) &jaya;</name> <price>20</price> <qty> 10</qty> </item> </order> </orders> DOM Java CODE � import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import java.io.File; import org.w3c.dom.*; public class order{ public static int depth; public static void changeOrder(Node root, String elementName, String elementValue) { Node n; Node firstChild; try{ Document doc = root.getOwnerDocument(); NodeList nList = doc.getElementsByTagName(elementName); for(int i=0; i<nList.getLength(); i++) { n = nList.item(i); // text node will be the first child firstChild = n.getFirstChild(); firstChild.setNodeValue(elementValue); } } catch(DOMException de) { System.out.println("DOMException::"+de.toString()); } catch(Exception e) { System.out.println("Exception::"+e.toString()); } } public static void showAttributes(Node element) { NamedNodeMap nnMap = element.getAttributes(); Node indexedNode; for(int i=0; i<nnMap.getLength(); i++) { for(int j=0; j<depth; j++) System.out.print(" "); indexedNode = nnMap.item(i); System.out.println("ATTR::"+indexedNode.getNodeName()+"="+ indexedNode.getNodeValue()+"("+getNodeType(indexedNode)+")"); } } public static String getNodeType(Node node) { short type; type = node.getNodeType(); String retNode = "UNKNOWN"; if(type == node.ELEMENT_NODE) retNode="ELEMENT_NODE"; if(type == node.ATTRIBUTE_NODE) retNode="ATTRIBUTE_NODE"; if(type == node.COMMENT_NODE) retNode="COMMENT_NODE"; if(type == node.PROCESSING_INSTRUCTION_NODE) retNode="PROCESSING_INSTRUCTION_NODE"; if(type == node.ENTITY_REFERENCE_NODE) retNode="ENTITY_REFERENCE_NODE"; if(type == node.ENTITY_NODE) retNode="ENTITY_NODE"; if(type == node.NOTATION_NODE) retNode="NOTATION_NODE";
for(int i=0;i<depth; i++) System.out.print(" "); // print the node information if(node.getNodeType() == node.TEXT_NODE) { if(node.getNodeValue().trim().length() > 0){ System.out.println(node.getNodeName()+"="+ node.getNodeValue()+"("+getNodeType(node)+")"); } else { System.out.println(node.getNodeName()+"="+"("+getNodeType(node)+")"); } } else { System.out.println(node.getNodeName()+"="+ node.getNodeValue()+"("+getNodeType(node)+")"); } // print the node attributes if(node.getNodeType() == node.ELEMENT_NODE) showAttributes(node); // recurse thru the children Node firstChild = node.getFirstChild(); while(firstChild!=null) { depth ++; recurseNodes(firstChild); firstChild = firstChild.getNextSibling(); } depth--; } public static void main (String args[]) { File docFile = new File("cc.xml"); Document doc = null; NamedNodeMap nnMap = null; int i; try { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setValidating(true); dbf.setExpandEntityReferences(false); dbf.setIgnoringElementContentWhitespace(true); DocumentBuilder docb = dbf.newDocumentBuilder(); doc = docb.parse(docFile); Element root = doc.getDocumentElement(); System.out.println("RootElement::"+root.getNodeName()); NodeList nList = root.getChildNodes(); System.out.println("No. of children for root node "+ nList.getLength()); depth=0; /* //recurseNodes(root); // Details of the DTD System.out.println("-------------DTD DETAILS----------"); DocumentType docType = doc.getDoctype(); System.out.println("DTD Name ::"+docType.getName()); nnMap = docType.getEntities(); System.out.println("No. of general Entities ::"+nnMap.getLength()); // Entity information for(i=0;i<nnMap.getLength();i++) { System.out.println("Index ::"+i+""+nnMap.item(i).getNodeName()+"="+ nnMap.item(i).getNodeValue()); } nnMap = docType.getNotations(); System.out.println("No. of Notations ::"+nnMap.getLength()); // Entity information for(i=0;i<nnMap.getLength();i++) { System.out.println("Index ::"+i+""+nnMap.item(i).getNodeName()+"="+ nnMap.item(i).getNodeValue()); System.out.println("Notation SYSTEM ::"+((Notation)nnMap.item(i)).getSystemId()); } // changing the element content // changeOrder(root, "status", "processed"); // recurseNodes(root); // adding new nodes Element newElement = doc.createElement("newElement"); // TBD:: Try to set a node value to an element node // TBD:: Try to create an element with an invalid name Node textNode = doc.createTextNode("newTextNode"); textNode.setNodeValue("NEW TEXT"); newElement.appendChild(textNode); root.appendChild(newElement); root.insertBefore(newElement, root.getFirstChild()); root.removeAttribute("Notation"); //root.normalize(); //recurseNodes(root); System.out.println(root.toString()); */ /* Node n = doc.getElementsByTagName("order").item(1); NodeList l = ((Element)n).getElementsByTagName("qty"); Node nn = l.item(0); Text t = doc.createTextNode("Move along, nothing to see here."); nn.appendChild(t) ; */ recurseNodes(root); /* root.normalize(); recurseNodes(n); */ } catch (DOMException de) { System.out.println("DOM Exception ::"+de.toString()); } catch (Exception e) { System.out.println("EXCEPTION::"+e.toString()); System.out.println(e.getClass()); } } } 5.SAX - SAX preparation should be very similar to DOM. The following website gives you Java�s implemtation of the API. All the java classes required to run examples are already available as a part of installing the xalan�s xslt processor on your m/c. http://java.sun.com/j2se/1.4.1/docs/api/org/xml/sax/package-summary.html
Try to be in take as many DIFFERENT mock exams as possible. All the best for your exam and please wish me good luck. Regards, Jayadev.
The only reason for time is so that everything doesn't happen all at once.
- Buckaroo Banzai
patrick gee
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Joined: Sep 30, 2002
Posts: 9
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Thanks Jaydev, Ur reply is a wonderful resource. I will try to do that if i have any problem i will get back to u. thanks man.
Anitha Lingam
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Joined: Apr 21, 2002
Posts: 38
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Jayadev, Can you please tell how to use the schema validator XSV to validate the xml documents against the given schemas Thanks
Balaji Loganathan
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Joined: Jul 13, 2001
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Originally posted by Anitha Lingam: Jayadev, Can you please tell how to use the schema validator XSV to validate the xml documents against the given schemas Thanks
Hope you won't mind if i reply. One easy way is go to the directroy where the xsv.exe is located(usually at /xsv12/ directory) Now store ur xml and/or xsd file in this directory (say foo.xml ) then open the command prompt at this location. typexsv -o result.xml -s xsv.xsl foo.xml Now open result.xml in IE or mozilla u will see the result of the validation. The another way is to use it online at http://www.w3.org/2001/03/webdata/xsv Regards Balaji
Balaji, Thanks for the reply. I learnt something from it. I generally use it as "xsv test.xml" and try to see the result on the screen. With the stuff u gave, we can see it in an output file and that is really convenient. Regards, Jayadev.
patrick gee
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Joined: Sep 30, 2002
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Hi folks, I try to validate the bookstore.xsd file thr' online it says "NO error". But when i try to do that thr' command prompt It says parser error... crash = "true" & bug = "validator crashed during target reading". Why is that? I try to do store the output in result.xml file like balaji told, there is nothing get stored even error msg. Help me with this!
Jayadev Pulaparty
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Joined: Mar 25, 2002
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The best thing in think is to do it locally thru the command prompt. If you can give the code for xml and the schema file in your reply, i'll try to figure out what's wrong with that.
Balaji Loganathan
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Originally posted by patrickgee: Hi folks, I try to validate the bookstore.xsd file thr' online it says "NO error". e with this!
Here u r trying to validate the XSD so u need to change the command option with -i for example to validate a schema foo.xsd use xsv -o result_schema.xml -s xsv.xsl -i foo.xsd BYW patrickgee plz read the message from John Wetherbie
patrick gee
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Joined: Sep 30, 2002
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Thanks balaji, It WORKS! Reg. John lot of naming policies in ranch!everything is already reserved. i cant find any useless display name, which i can remember other than my name! Sorry now i changed that.
mark stone
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thanks for the xml resources.
Anitha Lingam
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Joined: Apr 21, 2002
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Balaji and Jayadev, Thanks to both of you.
patrick gee
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Joined: Sep 30, 2002
Posts: 9
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Hi there, Can u guys tell me any other good resources for DOM & SAX. For XML certification do i have to concentrate more for SOAP & WSDL? What kind of questions can i expect from these 2? Thanks for ur time.
Valentin Crettaz
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xmlbeginner, Welcome to Javaranch We'd like you to read the Javaranch Naming Policy and change your publicly displayed name (change it here) to comply with our unique rule. Thank you. PS: Quote from the naming policy:
For your publicly displayed name, use a first name, a space, and a last name. Obviously fictitious names or improperly formatted names may be locked out.
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