@Override
    public void updateLast(Schema<?> schema, Schema<?> lastSchema)
    {
        if (lastSchema != null && lastSchema == this.schema)
        {
            this.schema = schema;
        }
    }
An output used for writing data with xml format.

@author David Yu
@created May 24, 2010
protostuff-xml/src/main/java/io/protostuff/XmlOutput.java