AttributeImpl implements Attribute { public String getPrefix() { return prefix; } protected  AttributeImpl(String namespaceURI, String prefix, String name,
			String value); String getNamespaceUri(); String getPrefix(); String getName(); String getValue(); void setOwner(Element owner); Element getOwnerElement(); @Override int hashCode(); @Override boolean equals(Object obj); @Override String toString(); Object clone();  }
@Test public void testGetPrefix() { ConcreteAttributeImpl attr = new ConcreteAttributeImpl("ns", "pre", "name", "value"); assertEquals("pre", attr.getPrefix()); }