Most messages sent between Web services are coded in XML. are programming hooks or guidelines, published by organizations tell how other programs can get a service to perform a task, such as send or receive data.

The answer is "Application programming interface(APIs)".

Explanation:

API is a series of routines, set of rules or methods for the development of the application. It uses the graphical UI element software for utilization.  

since it can be assumed that what aslam is making is a template by compiling all the commonly used excel formatting in several worksheets in an excel document, aslam can choose to save it using the .xltx or .xltm format instead. thus, aslam can distribute the templates he has made to his team members in an easier manner.

to be honest its playstation. it has a lot of games