• filter the elements to return a new FilteringCollection with a filtered set of elements
• sort the elements to return a new FilteringCollection with a defined sort order
• transform the elements to return a new FilteringCollection containing related elements
• provide a map of the elements against a predefined key

Usage - In the current version each FilteringCollection provides a set of predefined qualifier constants which can be passed into the select(Object) method used to filter the elements. Generally qualifiers have the prefix QUALIFIER_. A second method sort(Object) is used to create a new instance with a different element ordering, which takes an orderB< constant. Generally orderBys have the prefix ORDERBY_: examples are ShippingOrder.ORDERBY_ITEMID, ShippingOrder.ORDERBY_ITEMPOSITION, and ORDERBY_REVERSE can be used to provide a FilteringCollection with the reverse ordering. An example with method ShippingOrder.getItems():

var allItems : FilteringCollection = shippingOrder.items;
var productItems : FilteringCollection = allItems.select(ShippingOrder.QUALIFIER_PRODUCTITEMS);
var serviceItems : FilteringCollection = allItems.select(ShippingOrder.QUALIFIER_SERVICEITEMS);
var byPosition : FilteringCollection = productItems.sort(ShippingOrder.ORDERBY_ITEMPOSITION);
var revByPosition: FilteringCollection = byPosition.sort(FilteringCollection.ORDERBY_REVERSE);
var mapByItemID : Map = allItems.asMap();