udunits/src/main/java/ucar/units/UnitDBImpl.java
public final void addAlias(final String alias, final String name)
			throws NoSuchUnitException, UnitExistsException {
		addAlias(alias, name, null);
	}
public final void addAlias(final String alias, final String name)
			throws NoSuchUnitException, UnitExistsException {
		addAlias(alias, name, null);
	}
Adds an alias for a unit already in the database.

@param alias
An alias for the unit.
@param name
The name of the unit already in the database.
@throws UnitExistsException
Another unit with the same name or symbol already exists in
the database.
@throws NoSuchUnitException
The unit isn't in the database.