Hello!
I've written a small program to parse xml files. It's for a university project, every
xml file has the same structure so please don't wonder why my code looks so bad ;-)
The problem is that the following if loop doesn't extract the value:
if (node.getNodeName().equals("rdf:li")) {
Element element = (Element)node;
if (element.hasAttribute("xml:lang")) {
System.out.println(node.getNodeValue());
}
}
When I say node.getNodeName() it tells me the correct Name, but NodeValue() just tells
null. It shouldn't do that.
The part of the xml file looks like this:
<dc:title>
<rdf:Alt>
<rdf:li xml:lang="en">Convergence of some two-level overlapping domain
decomposition preconditioners with smoothed aggregation coarse spaces�
</rdf:li>
</rdf:Alt>
</dc:title>
Do you have a clue what's wrong with it? Could it be a Xerces bug?
I've attached the full source and the xml file.
Thanks in advance for your help.
Greetings,
Christian Meyer
// package dom;
import java.io.Serializable;
import java.lang.*;
import java.util.*;
import org.w3c.dom.*;
import org.xml.sax.InputSource;
import org.xml.sax.ErrorHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.apache.xerces.parsers.DOMParser;
import ui.DOMParserSaveEncoding;
public class DOMTest {
public static void arbeite(NodeList nodes) {
int len = (nodes != null) ? nodes.getLength() : 0;
// System.out.println(len);
for (int i=0; i < len; i++) {
Node node = nodes.item(i);
switch (node.getNodeType()) {
case Node.DOCUMENT_NODE: {
System.out.println("Document Node " + node.getNodeName() );
// arbeite(node.getChildNodes());
break;
}
case Node.ELEMENT_NODE: {
if (node.getNodeName().equals("rdf:Description")) {
if (node.getParentNode().getNodeName().equals("rdf:li") &&
node.getParentNode().getParentNode().getNodeName().equals("rdf:Bag")) {
Element element = (Element)node;
System.out.println(element.getAttribute("vCard:FN")); // for testing
ArrayList authors = new ArrayList();
authors.add(element.getAttribute("vCard:FN"));
}
}
if (node.getNodeName().equals("rdf:li")) {
if (node.getParentNode().getNodeName().equals("rdf:Alt") &&
node.getParentNode().getParentNode().getNodeName().equals("dc:identifier")) {
Element element = (Element)node;
System.out.println(element.getAttribute("rdf:resource")); // for testing
ArrayList fullTextSrc = new ArrayList();
fullTextSrc.add(element.getAttribute("rdf:resource"));
}
}
if (node.getNodeName().equals("rdf:Description")) {
if (node.getParentNode().getNodeName().equals("dcq:created")) {
Element element = (Element)node;
System.out.println(element.getAttribute("rdf:value")); // for testing
String dateCreated = element.getAttribute("rdf:value");
}
}
if (node.getNodeName().equals("rdf:Description")) {
if (node.getParentNode().getNodeName().equals("dcq:modified")) {
Element element = (Element)node;
System.out.println(element.getAttribute("rdf:value")); // for testing
String dateModified = element.getAttribute("rdf:value");
}
}
if (node.getNodeName().equals("rdf:li")) {
Element element = (Element)node;
if (element.hasAttribute("xml:lang")) {
System.out.println(node.getNodeValue());
}
}
arbeite(node.getChildNodes());
break;
}
default: {
// System.out.println("Default");
}
}
}
}
/*
public static String getAuthor1() {
return author1;
}
public static String getAuthor2() {
return author2;
}
public static String getFullTextSrc() {
return fullTextSrc;
}
public static String getDateModified() {
return dateModified;
}
public static String getDateCreated() {
return dateCreated;
}
public static String getTitle() {
return title;
}
*/
public static void main(String[] argv) {
String filename=argv[0];
String DEFAULT_PARSER_NAME = "org.apache.xerces.parsers.DOMParser";
DOMParserSaveEncoding parser;
try {
parser = new DOMParserSaveEncoding();
// ef.resetErrors();
// parser.setErrorHandler(ef);
parser.setFeature("http://apache.org/xml/features/dom/defer-node-expansion";,
false); // otherwise parser.getCurrentNode() == null
parser.setFeature("http://apache.org/xml/features/continue-after-fatal-error";,
true);
parser.setFeature("http://apache.org/xml/features/allow-java-encodings";, true);
parser.parse(filename);
Document document = parser.getDocument();
NodeList nodes = document.getChildNodes();
arbeite(nodes);
} catch (Exception ex) {
System.err.println(ex.getMessage());
ex.printStackTrace();
}
}
// ErrorStorer ef;
}
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema";
xmlns:dc="http://dublincore.org/documents/dces#";
xmlns:dcq="http://dublincore.org/documents/dcmes-qualifiers#";
xmlns:mathnet="http://www.ams.org/msc/";
xmlns:vCard="http://www.dstc.edu.au/Research/Projects/rdf/draft-iannella-vcard-rdf-00.txt";>
<rdf:Description rdf:about="http://www.ukoln.ac.uk/metadata/resources/dc/datamodel/WD-dc-rdf/";>
<dc:title>
<rdf:Alt>
<rdf:li xml:lang="en">Convergence of some two-level overlapping domain decomposition preconditioners with smoothed aggregation coarse spaces
</rdf:li>
</rdf:Alt>
</dc:title>
<dc:rights>
<rdf:Description rdfs:label=
"Copyright: The author(s) agree, that this abstract
may be stored as full text and distributed
as such by abstracting services."/>
</dc:rights>
<dc:creator rdf:ID="Creator">
<rdf:Bag>
<rdf:li>
<rdf:Description
rdf:ID="Creator_1"
vCard:FN="Caroline Lasser"
rdfs:label="Caroline Lasser"
vCard:EMAIL="[EMAIL PROTECTED]"
vCard:URL="http://www-m3.mathematik.tu-muenchen.de/m3/classer/index.de.html";
vCard:ORG="Zentrum Mathematik der Technischen Universität München">
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Person"/>
<vCard:N>
<rdf:Description vCard:Family="Lasser"
vCard:Given="Caroline"/>
</vCard:N>
</rdf:Description>
</rdf:li>
<rdf:li>
<rdf:Description
rdf:ID="Creator_2"
vCard:FN="Andrea Toselli"
rdfs:label="Andrea Toselli"
vCard:EMAIL="[EMAIL PROTECTED]"
vCard:URL="http://www.sam.math.ethz.ch/~toselli/";
vCard:ORG="Seminar for Applied Mathematics, ETH Zürich">
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Person"/>
<vCard:N>
<rdf:Description vCard:Family="Toselli"
vCard:Given="Andrea"/>
</vCard:N>
</rdf:Description>
</rdf:li>
</rdf:Bag>
</dc:creator>
<dc:contributor>
<rdf:Description rdfs:label="Michael Kaplan"
vCard:FN="Michael Kaplan"
vCard:EMAIL="[EMAIL PROTECTED]"
vCard:TEL="+49-89-289-24209">
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Person"/>
<vCard:N>
<rdf:Description vCard:Family="Kaplan"
vCard:Given="Michael"/>
</vCard:N>
</rdf:Description>
</dc:contributor>
<dc:language>
<rdf:Description rdf:value="en" rdfs:label="English ">
<rdfs:isDefinedBy rdf:resource="http://www.ietf.org/rfc/rfc1766.txt?number=1766"/>
</rdf:Description>
</dc:language>
<dc:identifier>
<rdf:Alt>
<rdf:li rdf:resource="http://www-lit.ma.tum.de/veroeff/quel/010.65012.pdf"/>
<rdf:li rdf:resource="http://www-lit.ma.tum.de/veroeff/quel/010.65012.ps.gz"/>
<rdf:li rdf:resource="http://triton.mathematik.tu-muenchen.de/~kaplan/smagg.ps"/>
</rdf:Alt>
</dc:identifier>
<dcq:issued>
<rdf:Description rdf:value="2001-09"
rdfs:label="September 2001">
<rdfs:isDefinedBy rdf:resource="http://www.uic.edu/year2000/datefmt.html"/>
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Point"/>
</rdf:Description>
</dcq:issued>
<dcq:created>
<rdf:Description rdf:value="2001-09-07"
rdfs:label="07 September 2001">
<rdfs:isDefinedBy rdf:resource="http://www.uic.edu/year2000/datefmt.html"/>
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Point"/>
</rdf:Description>
</dcq:created>
<dcq:modified>
<rdf:Description rdf:value="2001-09-26"
rdfs:label="26 September 2001">
<rdfs:isDefinedBy rdf:resource="http://www.uic.edu/year2000/datefmt.html"/>
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Point"/>
</rdf:Description>
</dcq:modified>
<dc:type rdf:resource="http://MathNet.preprints.org/SCHEME1.0#Preprint"/>
<mathnet:primarySubject>
<rdf:Alt>
<rdf:li>
<rdf:Description rdf:value="65F10" rdfs:label="Numerical analysis, Numerical linear algebra, Iterative methods for linear systems [See also 65N22]">
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Classification"/>
<rdfs:isDefinedBy>
<rdf:Description rdfs:label="Mathematical Subject Classification Scheme (MSC2000)">
<rdf:value rdf:resource="http://www.ams.org/msc/"/>
</rdf:Description>
</rdfs:isDefinedBy>
</rdf:Description>
</rdf:li>
</rdf:Alt>
</mathnet:primarySubject>
<mathnet:secondarySubject>
<rdf:Alt>
<rdf:li>
<rdf:Description rdf:value="65N22" rdfs:label="Numerical analysis, Partial differential equations, boundary value problems, Solution of discretized equations [See also 65Fxx, 65Hxx]">
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Classification"/>
<rdfs:isDefinedBy>
<rdf:Description rdfs:label="Mathematical Subject Classification Scheme (MSC2000)">
<rdf:value rdf:resource="http://www.ams.org/msc/"/>
</rdf:Description>
</rdfs:isDefinedBy>
</rdf:Description>
</rdf:li>
</rdf:Alt>
</mathnet:secondarySubject>
<mathnet:Subject>
<rdf:Alt>
<rdf:li>
<rdf:Description rdf:value="65F10" rdfs:label="Numerical analysis, Numerical linear algebra, Iterative methods for linear systems [See also 65N22]">
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Classification"/>
<rdfs:isDefinedBy>
<rdf:Description rdfs:label="Mathematical Subject Classification Scheme (MSC2000)">
<rdf:value rdf:resource="http://www.ams.org/msc/"/>
</rdf:Description>
</rdfs:isDefinedBy>
</rdf:Description>
</rdf:li>
<rdf:li>
<rdf:Description rdf:value="65N22" rdfs:label="Numerical analysis, Partial differential equations, boundary value problems, Solution of discretized equations [See also 65Fxx, 65Hxx]">
<rdf:type rdf:resource="http://purl.org/dc/terms/1.0/Classification"/>
<rdfs:isDefinedBy>
<rdf:Description rdfs:label="Mathematical Subject Classification Scheme (MSC2000)">
<rdf:value rdf:resource="http://www.ams.org/msc/"/>
</rdf:Description>
</rdfs:isDefinedBy>
</rdf:Description>
</rdf:li>
</rdf:Alt>
</mathnet:Subject>
<dcq:abstract>
<rdf:Description>
<dc:language>
<rdf:Description rdf:value="en"
rdfs:label="English ">
</rdf:Description>
</dc:language>
<rdf:value resource= "http://www-lit.ma.tum.de/veroeff/html/010.65012.html#Abstract"; />
</rdf:Description>
</dcq:abstract>
<dc:subject>
<rdf:Description>
<rdfs:label rdf:parseType="Literal">domain decomposition; overlapping Schwarz methods; preconditioning; smoothed aggregation </rdfs:label>
</rdf:Description>
</dc:subject>
</rdf:Description>
</rdf:RDF>
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