Gets the value of the listing property.
This accessor method returns a reference to the live list,
not a snapshot. Therefore any modification you make to the
returned list will be present inside the JAXB object.
This is why there is not a set
method for the listing property.
For example, to add a new item, do as follows:
getListing().add(newItem);
Objects of the following type(s) are allowed in the list
{@link Listing }
if (listing == null) {
listing = new ArrayList<Listing>();
}
return this.listing;