serialize method
Implementation
@override
serialize(XmlBuilder builder) {
super.serialize(builder);
if (content != null) {
builder.text(content!);
}
if (binding != null) {
builder.attribute('binding', binding!);
}
if (format != null) {
builder.attribute('format', format!);
}
builder.attribute('lineWidth', lineWidth);
builder.attribute('showText', showText);
}