Several output formatters are supported:
- CSV
- GSA Feed (Google Search Appliance)
- In Memory (for test purposes mostly)
- JSON
- Sitemap
- XML
- Excel XML
- XLS (MS Excel)
You may also create your own. To do so, simply create a class that implements the Exporter\Writer\WriterInterface,
or better, if you know what Content-Type header should be used along with
your output and what format it produces, TypedWriterInterface.