Adding and Removing an Attribute in a DOM Element
If any special characters appear in the value of an attribute
(e.g., <>"), they are automatically converted to entities by the XML writers.
This is the sample input for the example:
The resulting XML from running the example is:
// Obtain an element; this method is implemented in
// The Quintessential Program to Create a DOM Document from an XML File
Document doc = parseXmlFile("infilename.xml", true);
Element element = doc.getElementById("key1");
// Add an attribute
element.setAttribute("newAttrName", "attrValue");
// Change the value of an attribute.
// Special characters are automatically converted to entities by the XML writer.
element.setAttribute("newAttrName", "<>&\"'");
// Remove an attribute
element.removeAttribute("value");
// However, if the attribute has a default value, the attribute cannot be removed
boolean has = element.hasAttribute("value"); // true
// The effect of removing an attribute with a default value
// is to set the attribute to the default value
String attrValue = element.getAttribute("value"); // mydefault
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map [ <!ELEMENT map (entry*) >
<!ELEMENT entry EMPTY >
<!ATTLIST entry key ID #REQUIRED
value CDATA "mydefault"> ]>
<map>
<entry key="key1" value="value1"/>
<entry key="key2" />
</map>
<?xml version="1.0" encoding="UTF-8"?>
<map>
<entry key="key1" newAttrName="<>&"'" value="mydefault"/>
<entry key="key2" value="mydefault"/>
</map>
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