XML document creation using reflection

Hi all,
I'm tyring to write a class which creates an XML document from objects passed in. For example, you call the add(Object) method and it takes your object, uses reflection, then outputs XML like this...
<fieldName>fieldValue<fieldName>
The only problem is that after looking through this forum I am a little concerned about the performance of my proposed solution (using reflection).
The class will be used in a batch process which processes millions of objects (to generate a whopping XML file that'll be sent on for further processing by a third party).
Is there a better way to do this than by using reflection?
This class is going to be used by multiple batch processes hence there will be lots of different object types passed (they'll also be new ones in the future that we don't even know about yet) hence my reflection choice.
Thanks,
Chris

The only problem is that after looking through this
forum I am a little concerned about the performance of
my proposed solution (using reflection).The only way that you'll know for sure is if you try it out. Write the code, test it, then run it in a profiler to find out where the performance problems (if any) are.
Is there a better way to do this than by using
reflection?Probably not, if you want to pass any arbitrary object to it.
One possible alternative is to have "XML aware" objects: define an interface WritesXML, that defines a method toXML(). You then check to see whether the given object implements this interface, and if it does you simply call the method, otherwise you use reflection.
Another alternative, assuming that your objects follow the Bean pattern, is to create "XML-ifiers" on the fly, similar to the way an app-server handles JSPs. First time you see an object you create a class that will write it to XML, then compile this class and invoke it for all subsequent objects. This will require that you have a JDK installed on the runtime machine, that the objects follow the Bean pattern, and that the number of instances of a given class are very high.
This class is going to be used by multiple batch
processes hence there will be lots of different object
types passed (they'll also be new ones in the future
that we don't even know about yet) hence my reflection
choice.Sounds like a good reason to use reflection.

Similar Messages

Xml document validation using Schema

I want to validate XML Document using XML Schema...
does any body have an idea how to do it.
Every time i m running my java file by using different XML FILE AND XSD FILE in command line i m getting same error.
error is:
Exception in thread "main" org.xml.sax.SAXException: Error: URI=null Line=2: s4s-elt-schema-ns: The namespace of element 'catalog' must be from the schema name space.
at org.apache.xerces.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1115)
at SAXLocalNameCount.main(SAXLocalNameCount.java:117)
Below is my java code with xml file and schema file.
plz get back to me as soon as possible it is urgent.
thanx
java File
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import java.util.*;
import java.io.*;
public class SAXLocalNameCount extends DefaultHandler {
/** Constants used for JAXP 1.2 */
static final String JAXP_SCHEMA_LANGUAGE =
"http://java.sun.com/xml/jaxp/properties/schemaLanguage";
static final String W3C_XML_SCHEMA =
"http://www.w3.org/2001/XMLSchema";
static final String JAXP_SCHEMA_SOURCE =
"http://java.sun.com/xml/jaxp/properties/schemaSource";
/** A Hashtable with tag names as keys and Integers as values */
private Hashtable tags;
// Parser calls this once at the beginning of a document
public void startDocument() throws SAXException {
tags = new Hashtable();
// Parser calls this for each element in a document
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts)
throws SAXException
String key = localName;
Object value = tags.get(key);
if (value == null) {
// Add a new entry
tags.put(key, new Integer(1));
} else {
// Get the current count and increment it
int count = ((Integer)value).intValue();
count++;
tags.put(key, new Integer(count));
System.out.println("TOTAL NUMBER OF TAG IN FILE = "+count);
// Parser calls this once after parsing a document
public void endDocument() throws SAXException {
Enumeration e = tags.keys();
while (e.hasMoreElements()) {
String tag = (String)e.nextElement();
int count = ((Integer)tags.get(tag)).intValue();
System.out.println("Local Name \"" + tag + "\" occurs " + count
+ " times");
static public void main(String[] args) throws Exception {
String filename = null;
String schemaSource = null;
// Parse arguments
schemaSource = args[0];
filename = args[1];
// Create a JAXP SAXParserFactory and configure it
SAXParserFactory spf = SAXParserFactory.newInstance();
// Set namespaceAware to true to get a parser that corresponds to
// the default SAX2 namespace feature setting. This is necessary
// because the default value from JAXP 1.0 was defined to be false.
//spf.setNamespaceAware(true);
// Validation part 1: set whether validation is on
spf.setValidating(true);
// Create a JAXP SAXParser
SAXParser saxParser = spf.newSAXParser();
System.out.println(" saxparser "+saxParser);
// Validation part 2a: set the schema language if necessary
if (true) {
try {
saxParser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
System.out.println(" saxparser ");
} catch (SAXNotRecognizedException x) {
// This can happen if the parser does not support JAXP 1.2
System.err.println(
"Error: JAXP SAXParser property not recognized: "
+ JAXP_SCHEMA_LANGUAGE);
System.err.println(
"Check to see if parser conforms to JAXP 1.2 spec.");
System.exit(1);
// Validation part 2b: Set the schema source, if any. See the JAXP
// 1.2 maintenance update specification for more complex usages of
// this feature.
if (schemaSource != null) {
saxParser.setProperty(JAXP_SCHEMA_SOURCE, new File(schemaSource));
System.out.println(" saxparser 123");
// Get the encapsulated SAX XMLReader
XMLReader xmlReader = saxParser.getXMLReader();
System.out.println(" XML READER "+xmlReader);
// Set the ContentHandler of the XMLReader
xmlReader.setContentHandler(new SAXLocalNameCount());
System.out.println(" XML READER 345 ");
// Set an ErrorHandler before parsing
xmlReader.setErrorHandler(new MyErrorHandler(System.err));
System.out.println(" XML READER 67878 ");
// Tell the XMLReader to parse the XML document
xmlReader.parse(filename);
System.out.println(" XML READER ");
// Error handler to report errors and warnings
private static class MyErrorHandler implements ErrorHandler {
/** Error handler output goes here */
private PrintStream out;
MyErrorHandler(PrintStream out) {
this.out = out;
* Returns a string describing parse exception details
private String getParseExceptionInfo(SAXParseException spe) {
String systemId = spe.getSystemId();
if (systemId == null) {
systemId = "null";
String info = "URI=" + systemId +
" Line=" + spe.getLineNumber() +
": " + spe.getMessage();
return info;
// The following methods are standard SAX ErrorHandler methods.
// See SAX documentation for more info.
public void warning(SAXParseException spe) throws SAXException {
out.println("Warning: " + getParseExceptionInfo(spe));
public void error(SAXParseException spe) throws SAXException {
String message = "Error: " + getParseExceptionInfo(spe);
throw new SAXException(message);
public void fatalError(SAXParseException spe) throws SAXException {
String message = "Fatal Error: " + getParseExceptionInfo(spe);
throw new SAXException(message);
xml file(books.xml)
<?xml version="1.0"?>
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
<book id="bk103">
<author>Corets, Eva</author>
<title>Maeve Ascendant</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-11-17</publish_date>
<description>After the collapse of a nanotechnology
society in England, the young survivors lay the
foundation for a new society.</description>
</book>
<book id="bk104">
<author>Corets, Eva</author>
<title>Oberon's Legacy</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2001-03-10</publish_date>
<description>In post-apocalypse England, the mysterious
agent known only as Oberon helps to create a new life
for the inhabitants of London. Sequel to Maeve
Ascendant.</description>
</book>
<book id="bk105">
<author>Corets, Eva</author>
<title>The Sundered Grail</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2001-09-10</publish_date>
<description>The two daughters of Maeve, half-sisters,
battle one another for control of England. Sequel to
Oberon's Legacy.</description>
</book>
<book id="bk106">
<author>Randall, Cynthia</author>
<title>Lover Birds</title>
<genre>Romance</genre>
<price>4.95</price>
<publish_date>2000-09-02</publish_date>
<description>When Carla meets Paul at an ornithology
conference, tempers fly as feathers get ruffled.</description>
</book>
<book id="bk107">
<author>Thurman, Paula</author>
<title>Splish Splash</title>
<genre>Romance</genre>
<price>4.95</price>
<publish_date>2000-11-02</publish_date>
<description>A deep sea diver finds true love twenty
thousand leagues beneath the sea.</description>
</book>
<book id="bk108">
<author>Knorr, Stefan</author>
<title>Creepy Crawlies</title>
<genre>Horror</genre>
<price>4.95</price>
<publish_date>2000-12-06</publish_date>
<description>An anthology of horror stories about roaches,
centipedes, scorpions and other insects.</description>
</book>
<book id="bk109">
<author>Kress, Peter</author>
<title>Paradox Lost</title>
<genre>Science Fiction</genre>
<price>6.95</price>
<publish_date>2000-11-02</publish_date>
<description>After an inadvertant trip through a Heisenberg
Uncertainty Device, James Salway discovers the problems
of being quantum.</description>
</book>
<book id="bk110">
<author>O'Brien, Tim</author>
<title>Microsoft .NET: The Programming Bible</title>
<genre>Computer</genre>
<price>36.95</price>
<publish_date>2000-12-09</publish_date>
<description>Microsoft's .NET initiative is explored in
detail in this deep programmer's reference.</description>
</book>
<book id="bk111">
<author>O'Brien, Tim</author>
<title>MSXML3: A Comprehensive Guide</title>
<genre>Computer</genre>
<price>36.95</price>
<publish_date>2000-12-01</publish_date>
<description>The Microsoft MSXML3 parser is covered in
detail, with attention to XML DOM interfaces, XSLT processing,
SAX and more.</description>
</book>
<book id="bk112">
<author>Galos, Mike</author>
<title>Visual Studio 7: A Comprehensive Guide</title>
<genre>Computer</genre>
<price>49.95</price>
<publish_date>2001-04-16</publish_date>
<description>Microsoft Visual Studio 7 is explored in depth,
looking at how Visual Basic, Visual C++, C#, and ASP+ are
integrated into a comprehensive development
environment.</description>
</book>
</catalog>
(books.xsd)
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="catalog">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="book" minOccurs="0" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="author" type="xsd:string"/>
<xsd:element name="title" type="xsd:string"/>
<xsd:element name="genre" type="xsd:string"/>
<xsd:element name="price" type="xsd:float"/>
<xsd:element name="publish_date" type="xsd:date"/>
<xsd:element name="description" type="xsd:string"/>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:string"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>

Add xmlns:xsi attribute to the root element <catalog>.
<catalog xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation='books.xsd'>

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How to declare the namespace of XML document to use in oracle DB?

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hi experts,
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Hi,
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Problem in XML Message creation using ABAP Proxy

Hi,
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Thanks,
Sandeep

Hi,
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just mention along with order ...
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Hi shiva,
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Extracting data from an XML document that uses namespaces

Hello all,
Firstly, please let me wish you all a very happy and prosperous 2013!
I have a piece of XML containing namespaces (retrieved from a web service) and I am having difficulty extracting values
(If you're interested this is the webservice: http://api.worldbank.org/countries/FRA/indicators/NY.GDP.MKTP.CD?date=2009)
Here is some test code with two cases -
1) where I leave in the namespace and
2) where I strip out all references to the namespace
Case 1 doesn't work, whereas Case 2 works well.
I would prefer a more elegant solution than simply stripping out the namespace.
I have probably just misunderstood something about how to work with namespaces in PL/SQL.
Do any of you have suggestions about how best to approach this?
Many thanks in advance.
Niall.
set serveroutput on
set define off
DECLARE
v_xml XMLTYPE;
v_clob CLOB;
v_country VARCHAR2(255);
BEGIN
v_clob := '<?xml version="1.0" encoding="utf-8"?>
<wb:data page="1" pages="1" per_page="50" total="1" xmlns:wb="http://www.worldbank.org">
<wb:data>
<wb:indicator id="NY.GDP.MKTP.CD">GDP (current US$)</wb:indicator>
<wb:country id="FR">France</wb:country>
<wb:date>2009</wb:date>
<wb:value>2619685000757.11</wb:value>
<wb:decimal>0</wb:decimal>
</wb:data>
</wb:data>';
v_xml := XMLTYPE(v_clob);
SELECT extractvalue(v_xml,'/data/data[1]/country', 'xmlns:"http://www.worldbank.org/"')
INTO v_country
FROM dual;
dbms_output.put_line(' ');
dbms_output.put_line('*** Case 1');
dbms_output.put_line('*** '||nvl(v_country,'nothing'));
dbms_output.put_line(v_xml.getStringVal());
v_xml := XMLTYPE(replace(v_clob,'wb:')); -- strip out wb:
SELECT extractvalue(v_xml,'/data/data[1]/country', 'xmlns:"http://www.worldbank.org/"')
INTO v_country
FROM dual;
dbms_output.put_line(' ');
dbms_output.put_line('*** Case 2');
dbms_output.put_line('*** '||nvl(v_country,'nothing'));
dbms_output.put_line(v_xml.getStringVal());
END;
/

Your case 1 query should be
(not tested)
SELECT extractvalue(v_xml,'/wb:data/wb:data[1]/wb:country', 'xmlns:wb="http://www.worldbank.org/"')If the XML is going to be small, you could also do it this way purely in PL/SQL
[url http://anononxml.blogspot.com/2010/06/xml-parsing-with-namespaces-via-plsql.html]XML Parsing with Namespaces via PL/SQL. Ignore the DOMDocument examples (first two) in there.
If the XML will be large and you are on 11.1 or greater, then it would be faster to insert the XML into a column in a DB table (could be a global temporary table) where the column is XMLType and the storage is SECUREFILE BINARY (default on 11.2.0.2+). Then you could use XMLTable, like
[url http://anononxml.blogspot.com/2010/08/xml-parsing-with-namespaces-via.html]XML Parsing with Namespaces via XMLTable

Best class to use to cache an XML document

Hello all,
I have an utility class representing an XML document, used withing a web application. This document shall be cached in the session since within a request and during the sessions I read it often and to several other things like XPath and XSLT.
But I am having problems due to this Bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6322678
and keep bad file descriptor errors due to these stream "specialities". There is a standard way of using cached+precompiled XSL templates and I wonder if there is a similar things for XML documents.
So I need an internal variable in my class containing the raw XML document - so using streams is not an ideal solution in regards of the bug - i am getting "bad file descriptor" errors from time to time.
I am playing with the idea of storing the XML document within a simple String and create the required Class from it for the according operations like XPath evaluation and XSL transformation. But I think that is quite more resource hungry than reading the XML document from the filesystem each time...
Has anyone some hints on how to keep an XML document in memory internally?
Thanks and regards,
Timo

Rehi,
So, everything works really fine! Thanks. As promised, here some examples
with bad indentations etc...:
Doing XSL transformation:
import java.io.StringWriter;
import org.w3c.dom.Document;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.Templates;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.stream.StreamResult;
TransformerFactory tFac = TransformerFactory.newInstance();
Templates compiledXslt = tFac.newTemplates(sheet);
Transformer transformer = compiledXslt.newTransformer();
StringWriter sw = new StringWriter();
StreamResult sr = new StreamResult(sw);
transformer.transform(new DOMSource(this.doc), sr);
System.err.println(sw.toString());************************
Doing XPath was a surprise and was originally my problem (I called evaluate() with an InputStream that occassioannly failed), I tried also here with new DOMSource() what also failed although not being null or so... funny: evaluate() can directly be called w/ dom.Document:
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
(this.doc is a org.w3c.dom.Document)
public String getXPathEvaluationAsString(String expr) {
     try {
          XPath xp = XPathFactory.newInstance().newXPath();
          return (String)xp.evaluate(
               expr,
               this.doc,
               XPathConstants.STRING
     } catch(Exception e) {
          e.printStackTrace();
     return " ";
}Thanks and regards,
Timo

Loading/breaking large files containing multiple XML documents using plsql

Hi I have a requirement where in the client sends the multiple xml payloads/documents in a single text file. I need to load that into the xmltype varialbe. How to do this?
I'm able to load the entire document into a clob object, here.. all the xml payloads are loaded into a single row. When I try to access this I get a error
ORA-31001: Invalid resource handle or path name "/MobileInventoryResponse.dtd"
ORA-06512: at "SYS.XMLTYPE", line 254
ORA-06512: at line 1
This error is due to the dtd present in the xml document : <!DOCTYPE MobileInventoryResponse SYSTEM "MobileInventoryResponse.dtd">
But if I load the data into a clob after removing the doctype reference then I get the following error. Here to mulitple xml documents are loaded into a single clob row.
ORA-31011: XML parsing failed
ORA-19202: Error occurred in XML processing
LPX-00209: PI names starting with XML are reserved
Error at line 81
ORA-06512: at "SYS.XMLTYPE", line 254
ORA-06512: at line 1
When try to access this by using select xmltype(x) from t
where x is column type of clob.
Please let me know any method or type loading the multiple xml documents by using plsql. Only plsql method. There is a way by using SAX Loader. But can it be used in plsql or its a java method of loading.
Regards,
Naveen
Edited by: MAN on Oct 18, 2008 9:21 PM

sorry for that...
There was enter character between some tags. From there I'm not receiving that particular error.
Now what I get is
ORA-31001: Invalid resource handle or path name "/MobileInventoryResponse.dtd"
ORA-06512: at "SYS.XMLTYPE", line 254
ORA-06512: at line 1
ORA-06512: at line 39
This is because there is a doctype at the start of the xml payload.
But if there is no <!DOCTYPE MobileInventoryResponse SYSTEM "MobileInventoryResponse.dtd"> this statement then it works fine.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE MobileInventoryResponse SYSTEM "MobileInventoryResponse.dtd">
<MobileInventoryResponse>
And this exercise I'm doing in my Windows xp loaded operating system with a local instance of oracle ... Do i need to do any other setting.
Along with that I followed your method mentioned @ Re: LPX-00209: PI names starting with XML are reserved
ignore:=dbms_xdb.createResource('/MobileInventoryResponse.dtd',bfilename('XML_DIR','MobileInventoryResponse.dtd'));
And I'm not getting how it will refer the this resource.
this above partilcular statement . should it be executed when ever we insert into the table ? But in the dtd there is no word saying "MobileInventoryResponse".
got this error.
ORA-31011: XML parsing failed
ORA-19202: Error occurred in XML processing
LPX-00104: Warning: element "MobileInventoryResponse" is not declared in the DTD
Error at line 1
ORA-06512: at "SYS.XMLTYPE", line 254
ORA-06512: at line 1
ORA-06512: at line 21
This is how I'm doing in the block
DECLARE
l_filehandle UTL_FILE.FILE_TYPE;
l_filename VARCHAR2(50):='test.xml';
l_rec_data VARCHAR2(500);
l_rec_trim_data VARCHAR2(500);
l_rec_trim_upper VARCHAR2(500);
l_rec_full_data CLOB;
ignore boolean;
BEGIN
l_filehandle := UTL_FILE.FOPEN('XML_DIR',l_filename,'R');
--dbms_xdb.deleteResource('/MobileInventoryResponse.dtd',dbms_xdb.DELETE_RESOURCE );
LOOP
ignore:=dbms_xdb.createResource('/MobileInventoryResponse.dtd',bfilename('XML_DIR','MobileInventoryResponse.dtd'));
commit;
UTL_FILE.GET_LINE(l_filehandle, l_rec_data);
--dbms_output.put_line('l_rec_data : '|| l_rec_data);
-- Trim the record to remove spaces
l_rec_trim_data := TRIM(l_rec_data);
l_rec_trim_upper := UPPER(l_rec_trim_data);
l_rec_full_data := l_rec_full_data||l_rec_data;
IF l_rec_trim_upper LIKE '</MOBILEINVENTORYRESPONSE>' THEN
dbms_output.put_line('l_rec_full_data : '||l_rec_full_data);
INSERT INTO library_xml VALUES(xmltype(l_rec_full_data));
l_rec_full_data:=NULL;
END IF;
dbms_xdb.deleteResource('/MobileInventoryResponse.dtd',dbms_xdb.DELETE_RESOURCE );
commit;
END LOOP;
UTL_FILE.FCLOSE(l_filehandle);
COMMIT;
--exception just for testing purpose
EXCEPTION
WHEN no_data_found THEN
NULL;
commit;
END;
Edited by: MAN on Oct 21, 2008 2:47 AM

No default attributes while Parsing XML document

Hellow.
I have such a problem:
I have XML document that uses XSD-schema.
In XSD-schema there is element that have two atributes:
<xsd:complexType name = "El1">
<xsd:attribute name = "atr1" xsd:default = "0" type = "xsd:boolean"/>
<xsd:attribute name = "atr2" default = "0" type = "xsd:boolean"/>
</xsd:complexType>And in XML document I write:
<El1 atr1 = "1"/>According to the XSD-schema parser must add to El1 second attribute "atr2" with its default value because it has default value. But when I do such a code:
factory = DocumentBuilderFactory.newInstance();
builder = factory.newDocumentBuilder();
doc = builder.parse(new File("file1.xml"));
Element pEl;
pEl = doc.getDocumentElement()
NamedNodeMap Attribs = pEl.getAttributes();In the list of attributes "Attribs" - there is no attribute "attr1"!!!
What I have to do???

Hello All
I am new to this parsing world. I have a doubt. I have an XML like
<xml>
<platform name = "windows">
<computer>
<hostname> hostname1 </hostname>
<IPAddress>127.0.3.03 </IPAddress>
</computer>
<computer>
<hostname> hostname2 </hostname>
<IPAddress>127.0.3.04 </IPAddress>
</computer>
</platform>
<platform name = "unix">
<computer>
<hostname> hostname6 </hostname>
<IPAddress>127.0.3.08 </IPAddress>
</computer>
<computer>
<hostname> hostname7 </hostname>
<IPAddress>127.0.3.09 </IPAddress>
</computer>
</platform>
</xml>
If i want to get details about individual computer under each platform as a string how do i do that?
Which parser would be ideal to be used DOM or SAX.

Multiple XML documents in one SWF

Hi, i'm trying to create a mix and match clothing application
using flash for a school project but am having trouble with xml
documents. Using an online tutorial, i found it was quite easy to
load up one xml document, example of code below.
I thought it would be as simple as copying all the code and
changing the variable names to load a second xml document but i
find when i run the code, that only the last xml document in the
code loads, could anyone give me any tips? Thanks
function loadXML(loaded) {
if (loaded) {
xmlNode = this.firstChild;
image = [];
description = [];
total = xmlNode.childNodes.length;
for (i=0; i<total; i++) {
image
= xmlNode.childNodes.childNodes[0].firstChild.nodeValue;
description
= xmlNode.childNodes.childNodes[1].firstChild.nodeValue;
firstImage();
} else {
content = "file not loaded!";
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("images.xml");

Hi, i checked my text and description boxes in my document,
and it is in fact loading the separate xml document, the problem
seems to stem from the fact that it is not displaying the xml image
within the movie clip.
I have two separate mc's on the stage, with different
instance names, flash displays the description of each separate xml
document, however, it only shows one of the movie clips images, if
i delete one from the actionscript, it shows the other, so it must
be something to do with them overwriting each other, i used a
trace, so i know the data is in flash for the images which arent
being shown, it just isn't showing for some reason.

Indices configuration for XML document analysis (indexing time problems)

Hi all,
I'm currently developing a tool for XML Document analysis using XQuery. We have a need to analyse the content of a large CMS dump, so I am adding all documents to a berkeley DB xml to be able to run xqueries against it.
In my last run I've been running to indexing speed problems, with single documents (typically 10-20 K in size) taking around 20 sec to be added to the database after 6000 documents (I've got around 20000 in total). The time needed for adding docs to the database drops with the number of documents.
I suspect my index configuration to be the reason for this performance drop. Indeed, I've been very generous with indexes, as we have to analyse the data and don't know the structure in advance.
Currently my index configuration includes:
- 2 default indicess: edge-element-presence-none and edge-attribute-presence-none to be able to speed up every possible xquery to analyse data patterns: ex. collection()//table//p[contains(.,'help')]
- 8 edge-attribute-substring-string indices on attributes we use often (id, value, name, ...)
- 1 edge-element-substring-string index on the root element of the xml documents to be able to speed up document searches: ex. collection()//page[contains(.,'help')]
So here my questions:
- Are there any possible performance optimisations in Database config (not index config)? I only set the following:
setTransactional(false);
envConf.setCacheSize(1024*64);
envConf.setCacheMax(1024*256);
- How can I test various index configuration on the fly? Are there any db tools that allow to set/remove indexes?
- Is my index config suspect? ;-)
Greetings,
Nils

Hi Nils,
The edge-element-substring-string index on the document element is almost certainly the cause of the slow document inserts - that's really not a good idea. Substring indexes are used to optimize "=", contains(), starts-with() and ends-with() when they are applied to the named element that has the substring index, so I don't think that index will do what you want it to.
John

XML document creation using reflection

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