We can easily find out how many URLs there will be when we start parsing.
Single threaded by nature; no benefit to mutiple threads since no data will be available until the entire document has been read and parsed.
The character data of each
element needs to be read.
Everything else can be ignored.
The format is very straight-forward so we don't need to traverse the entire tree.
The XML parsing is so straight-forward it can be done inside one method. No extra class is required.