fnMatchFunction = function (oNode) {
			if (oNode) {
				if (oNode.nodeState.selected && !oNode.isArtificial) {
					aResultContexts.push(oNode.context);
				}
			}
		}
Returns an array containing all selected contexts, ordered by their appearance in the tree.
@return {sap.ui.model.Context[]} an array containing the binding contexts for all selected nodes

@private