How to add custom parser to feedjira?

I have a xml feed in format like this:

<league country="england"><match status="15:00" time="15:00"><home name="Newcastle Utd"/><away name="Norwich"/></match><match status="15:00" time="15:00"><home name="Newcastle Utd"/><away name="Norwich"/></match><match status="19:00" time="19:00"><home name="Swansea"/><away name="Stoke City"/></match></league>

How can I add a custom parser in feedjira and use it for this feed? Thanks