Returns the local name part of the QName.
This function is useful when mapping XBRL instance documents containing hypercubes.
What the mapping does is filter those facts where the local name of the content of the explicit member (d-g:Vancouver) is equal to "Vancouver". Note that the content of the member is itself a QName.
All the facts that belong to the dimension GeographicalBreakdown are filtered and passed to the target component.