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Each character on your keyboard is assigned a unique number called an ASCII number You don t need to know these numbers, but if you re curious, look up ASCII table in a search engine and you ll see the ASCII numbers Some characters are nonprintable characters, such as a space inserted when you press the spacebar or the tab when you press the TAB key These are referred to as whitespace characters You ll find a list of these characters numbered from zero to 33 on the ASCII table Whitespace characters are inserted into a document to give instructions to the program that reads the document You don t see these on the screen, but a program, such as a parser, can see them For example, a carriage return and linefeed whitespace characters are inserted into a document when you press the ENTER key This gives the program instructions to move the cursor to the beginning of the next line You can tell the parser how to handle whitespace characters that appear in an XML document by using the xs:whiteSpace tag in the XML schema There are three things that you can do when you encounter a whitespace character in an XML document: preserve, replace, or collapse Preserve means that the parser does nothing special with the whitespace character It simply passes the whitespace characters along with the rest of the XML document Replace tells the parse to replace all whitespace characters with a space Collapse tells the parser to replace all whitespace characters with spaces (similar to replace), then it collapses multiple occurrences of whitespaces to a single space Furthermore, leading and trailing whitespaces are deleted You specify preserve, replace, and collapse as the value of the value attribute of the xs:whiteSpace tag Here is an example of preserve:.

import javaawt*;

import javanet*;

import javaappletApplet;

public class employees extends Applet{

static String filename;

Label firstNameLabel, lastNameLabel;

TextField text1, text2;

Button button1, button2;

Document d;

public static void main(String args[])

public void init()

firstNameLabel = new Label("First Name:");

add(firstNameLabel);

text1 = new TextField(24);

add(text1);

lastNameLabel = new Label("Last Name:");

<xs:element name="description"> <xs:simpleType> <xs:restriction base="xs:string"> <xs:whiteSpace value="preserve"/> </xs:restriction> </xs:simpleType> </xs:element>

add(lastNameLabel);

text2 = new TextField(24);

add(text2);

The cardinal rule for nancing a xer is to line up all the money you ll need in advance The reason is that once you get started tearing out walls and ooring, it will be far harder to convince any lender to give you a loan This means you ll have to calculate pretty closely just how much money it will take to do the entire x-up

button1 = new Button("<");

add(button1);

button2 = new Button(">");

add(button2);

URL url = null;

try {

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url = new URL("file:////c://xml//employees//employees xml");

catch (MalformedURLException e1) {

Systemoutprintln("Cannot create URL for: " + filename);

Systemexit(0);

d = new Document();

try {

A seemingly endless number of characters can be used as the content of an element However, other applications that use the data might restrict the number of characters they can receive from the XML document

dload(url);

catch (ParseException e3) {

dreportError(e3, Systemout);

if (d != null) {

showRecord(0);

Next we will make the two buttons, the forward and back buttons, active, and we do that in the + to keep track of the current record number: import commsxmlParseException;

import commsxmlDocument;

import commsxmlElement;

import javautilEnumeration;

import javaawt*;

Probably the hardest part of buying a xer is getting the seller to accept a reasonable price (Refer to our earlier formula for determining how much to pay) Sellers have heard that property prices have gone up And they want to participate on the boom Of course, they don t want to realistically discount their property because of the poor shape it s in All of which is to say, plan on doing lots of negotiation And plan on making lots of lowball offers, most of which won t be accepted

import javanet*;

import javaappletApplet;

public class employees extends Applet{

static String filename;

Label firstNameLabel, lastNameLabel;

TextField text1, text2;

Let s say that the lastname element of an XML document contains a name that is 40 characters long After the parser processes the XML document, the lastname is sent to a column of a table in a database The column permits up 35 characters This means five characters are truncated A common solution to this problem is to limit the number of characters that can be contained in the element You can do this by using the xs:maxLength tag in the XML schema The xs:maxLength has a value attribute that s assigned the maximum number of characters that can be placed in the element An error occurs if the content exceeds this value Here s how to set the maximum value of an element This sets the maximum length to 30 characters:

Button button1, button2;

Document d;

int currentRecordNumber = 0;

If the user presses the back button, button1, we decrement + method: public boolean action (Event e, Object o)

if(etargetequals(button1)){

if(currentRecordNumber > 0){

currentRecordNumber--;

showRecord(currentRecordNumber);

if(etargetequals(button2)){

if(currentRecordNumber < 4){

currentRecordNumber++;

showRecord(currentRecordNumber);

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