There are many advantages to hiring an XSL developer. One advantage is that XSL developers are highly skilled in XML and can therefore help you manage your XML data more effectively. Another advantage is that XSL developers can help you transform your XML data into other formats such as HTML or PDF, which can be very useful for creating web pages or reports. Finally, XSL developers are often able to develop custom applications on top of existing XML data, which can further extend the usefulness of your data.