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You use the ATTLIST keyword to identify the declaration of the attribute list Next to ATTLIST is the name of the element, which is customer in this example Each subsequent line declares an attribute The first attribute is called cust_id and is declared as character data (CDATA) The #REQUIRED keyword indicates that this attribute must be present for every customer (It doesn t need a value cust_id= would be perfectly valid XML because the attribute is present) That is, an error message is generated if there is a customer element that doesn t contain a cust_id attribute Table 3-2 lists other keywords that are used to describe the form of an attribute The last line in the code declares type as an attribute Valid values for this attribute are contained within the parentheses These are retail or wholesale The pipe (|) is the OR operator Only one of these values is considered a valid option Any other values cause an error message to generate when the XML document is processed Notice that retail is repeated within quotations This is the default value for this attribute If no type is entered, then the parser uses retail as the value for the type attribute Here s how these attributes are used in an XML document:

try {

dload(url);

catch (ParseException e) {

dreportError(e, Systemout);

if (d != null) {

doTree(dgetRoot(), "");

static void doTree(Element elem, String indent)

String attribString = " Attributes: ";

Enumeration attribEnum = elemgetAttributes();

while (attribEnumhasMoreElements()) {

Attribute attrib = ((Attribute)attribEnumnextElement ());

attribString += attribgetName() + " = " + attrib getValue() + " ";

Systemoutprintln(indent + elemgetTagName() + attribString);

if(elemnumElements() > 1){

Enumeration enum = elemgetChildren();

while (enumhasMoreElements()) {

Form #REQUIRED #FIXED Description The attribute is required but doesn t have any speci c default value The attribute is only allowed to have one value The attribute itself may be optional, but if it is present in the XML document, it can only have this value The value is not required and no default value is provided The text contained within the quotes is the default value

Element elem2 = (Element)enumnextElement();

doTree(elem2, indent + "

<!DOCTYPE DOCUMENT [

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Entities are made to be replaced; that is, when you include a reference to an entity in a document, you expect the parser to replace it with either other text or binary data For example, if you declare an entity named Number5 this way in the DTD <!ENTITY Number5 '5'>

then you can use that entity in the document like the following (Note that we surround the entity reference with the characters & and ;) <text>We have &Number5; bananas left</text>

There are many reasons the deal might fall through because of your fault For example, you could be counting on Aunt Harriet to give you the money for the down payment You get the seller to sign an offer, secure nancing, and poor Aunt Harriet has a heart attack and dies Her money will be tied up in probate for years Sure, you didn t do anything intentionally to quash the deal, but you don t have the expected money to perform As far as the seller is concerned, it s your fault Or you get cold feet You take a look at those huge monthly payments and you decide that you can t go through with it You want out, period Or you nd another house that is really perfect You want to get out of this deal so that you can get the other Or There are lots of reasons that you might not want to or not be able to complete your end of a purchase agreement The point here is, however, that for whatever reason, it s your fault the deal doesn t go forward, and if you don t have a contingency clause protecting you (see below), what are your chances of getting the deposit back

The parser will replace the entity reference, &Number5;, with the character '5': <text>We have 5 bananas left</text>

In this way, you expect entities to be replaced when you place them in a document You declare entities in the DTD See the EntityDecl term below: doctypedecl::= '<!DOCTYPE' S Name (S ExternalID)

S ('[' markupdecl* ']' S ) '>'

%NotationDecl | %conditionalSect | %PI | %S | %Comment )* )

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