code: function setConstraint(sKey, vValue) {
  			if (vValue !== undefined) {
  				mConstraints = mConstraints || {};
  				mConstraints[sKey] = vValue;
  			}
  		}
docs: /*
  Adds a constraint to the map of constraints if a value is given. Does not create the map
  or a constraint if not needed.
  
  @param {string} sKey The constraint's name
  @param {any} vValue The contraint's value