nokogiri xml diff
<?xml version="1.0" encoding="UTF-8"?>
<SourceDetails>
<Origin>FEED</Origin>
<Identifier>IR</Identifier>
<Timestamp>2017-01-01T02:11:01Z</Timestamp>
</SourceDetails>
<AsOfDate>2017-01-02</AsOfDate>
<Instrument>
<CommonCode>GB0</CommonCode>
</Instrument>
<Rate>0.69</Rate>