### Question:
XPathRecord implements Record { @Override public boolean isMutable() { return false; } XPathRecord(Document doc, Map<String, String> xpath_string_map); @Override List<Value> getValues(String field); @Override MutableRecord makeMutable(); @Override boolean isMutable(); @Override boolean hasField(String field); @Override Set<String> getFields();  }### Answer:
@Test public void testIsMutable() { assertFalse(rec.isMutable()); }