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See the article by Bosworth. It is tougher
code to enter and read, and it is brittle given
changes to the structure of a document.
http://www.fawcette.com/xmlmag/2002_12/magazine/columns/endtag/
This:
XML x = getxml("somewhere");
PERatio = x.price/( x.revenues -
x.expenses);
vs
Tree t = ParseXML("somewhere");
PERatio = number(t.getmember(
"/stock/price")) /
(( number(t.getmember(
"/stock/revenues") - number(
t.getmember("/stock/expenses"))
or
XMLReader xmlreader = new SAXParser();
ContentHandler contentHandler =
new MyContentHandler();
xmlreader.setContentHandler(contentHandler);
String uri = "test.xml";
InputSource is = new InputSource(
new FileInputStream(new File(uri)));
xmlreader.parse(is);
double result = contentHandler.getPERatio()
plus his listing for the contentHandler
class MyContentHandler implements
ContentHandler
{
String clName;
double num,price,revenue,expense;
public void characters(char ac[],
int start, int length)
throws SAXException
{
String s = new String(ac,start,length);
Try {if (!clName.equals("root")) num =
Double.parseDouble(s);}
catch(NumberFormatException e) {}
if (clName.equals("Price"))price = num;
if (clName.equals("Revenue"))revenue =
num;
if (clName.equals("Expense"))expense =
num;
}
public void startElement(
String nameSpaceURI, String localName,
String rawName, Attributes attributes)
throws SAXException
{ clName = localName; }
public double getPERatio()
{
if (revenue != expenses) return (
price / (revenue - expenses) else
return 0;
}
/** In addition, implement lots of dummy
void methods for endDocument,
endPrefixMapping, ignorableWhitespace,
processingInstruction,
setDocumentLocator, skippedEntity,
startDocument, endElement, and
startPrefixMapping.
**/
}
And we won't even get into namespaces. :-)
len
From: Murali Mani [mailto:mani@CS.UCLA.EDU]
On Thu, 16 Jan 2003, Bullard, Claude L (Len) wrote:
> XML-DEVers are often people with very large herds.
> You can do what you want to the sacred cow, but
> leave the productive milk cows alone.
>
> So you have alternatives. Let's hear about them.
> I don't like writing XPaths either.
>
> len
Hello, I did not know people did not like XPath expressions. can you tell
me some important reasons why. I will argue why I like Xpath expressions..
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