How to use

required

method

in

org.simpleframework.xml.ElementMap

/**
* Constructor for the <code>ElementMapLabel</code> object. This
* creates a label object, which can be used to convert an XML 
* node to a <code>Map</code> of XML serializable objects.
* 
* @param contact this is the contact that this label represents
* @param label the annotation that contains the schema details
* @param format this is the format used to style this label
*/
public ElementMapLabel(Contact contact, ElementMap label, Format format) {
 this.detail = new Introspector(contact, this, format);
 this.decorator = new Qualifier(contact);
 this.entry = new Entry(contact, label);
 this.required = label.required();
 this.type = contact.getType();
 this.inline = label.inline();
 this.override = label.name();      
 this.data = label.data();
 this.format = format;
 this.label = label;
}

/**
* Constructor for the <code>ElementMapLabel</code> object. This
* creates a label object, which can be used to convert an XML 
* node to a <code>Map</code> of XML serializable objects.
* 
* @param contact this is the contact that this label represents
* @param label the annotation that contains the schema details
* @param format this is the format used to style this label
*/
public ElementMapLabel(Contact contact, ElementMap label, Format format) {
 this.detail = new Introspector(contact, this, format);
 this.decorator = new Qualifier(contact);
 this.entry = new Entry(contact, label);
 this.required = label.required();
 this.type = contact.getType();
 this.inline = label.inline();
 this.override = label.name();      
 this.data = label.data();
 this.format = format;
 this.label = label;
}

/**
* Constructor for the <code>ElementMapLabel</code> object. This
* creates a label object, which can be used to convert an XML 
* node to a <code>Map</code> of XML serializable objects.
* 
* @param contact this is the contact that this label represents
* @param label the annotation that contains the schema details
* @param format this is the format used to style this label
*/
public ElementMapLabel(Contact contact, ElementMap label, Format format) {
 this.detail = new Introspector(contact, this, format);
 this.decorator = new Qualifier(contact);
 this.entry = new Entry(contact, label);
 this.required = label.required();
 this.type = contact.getType();
 this.inline = label.inline();
 this.override = label.name();      
 this.data = label.data();
 this.format = format;
 this.label = label;
}