Editing Application layer (section)

===Sublayers===
Originally the OSI model consisted of two kinds of application layer services with their related protocols.<ref>{{Cite web|url=https://networkencyclopedia.com/application-layer/|title = Application Layer (Layer 7 of the OSI Model)|date = September 2, 2019}}</ref> These two sublayers are the common application service element (CASE) and specific application service element (SASE).<ref name="Hura">{{cite book | last = Hura | first = Gurdeep | title = Data and Computer Communications: Networking and Internetworking | publisher = CRC Press LLC | year = 2001 |chapter= Application Layer |pages = [https://archive.org/details/datacomputercomm0000hura/page/710 710]–712 | isbn = 9780849309281 | url = https://archive.org/details/datacomputercomm0000hura | url-access = registration }}</ref><!-- this belongs in application layer?? --> Generally, an application layer protocol is realized by using the functionality of several application service elements.<ref>{{Cite report|url=https://tools.ietf.org/rfc/rfc1095|title = Common Management Information Services and Protocol over TCP/IP (CMOT)|date = April 1989| doi=10.17487/RFC1095 | last1=Warrier | first1=U.S. | last2=Besaw | first2=L. | url-access=subscription }}</ref> Some application service elements invoke different procedures based on the version of the session service available.<ref>{{Cite web|url=https://tools.ietf.org/html/rfc1085|title = ISO presentation services on top of TCP/IP based internets|date = December 1988|last1 = Rose|first1 = Marshall T.}}</ref>

====CASE====
The common application service element sublayer provides services for the application layer and request services from the session layer.
It provides support for common application services, such as:
* ACSE ([[Association Control Service Element]])<ref name="Hura"/>
* ROSE (Remote Operation Service Element)
* CCR (Commitment Concurrency and Recovery)
* RTSE (Reliable Transfer Service Element)

====SASE====
The specific application service element sublayer provides application-specific services (protocols), such as:
* [[FTAM]] (File Transfer, Access and Manager)
* [[Virtual terminal|VT]] (Virtual Terminal)
* MOTIS (Message Oriented Text Interchange Standard)
* CMIP (Common Management Information Protocol)
* JTM (Job Transfer and Manipulation)<ref>[http://www.furniss.co.uk/jtm/index.html a former OSI standard]{{dl|fix-attempted=yes|date=July 2023}}</ref>
* [[Manufacturing Message Specification|MMS]] (Manufacturing Messaging Specification)
* RDA (Remote Database Access)
* DTP (Distributed Transaction Processing)