[ubl-ndrsc] Comments to Tag Structure: Special Case of Markup Structure

["Stuhec, Gunther" <gunther.stuhec@sap.com>]

Hello,
Mark describes in his document "Position Paper: Tag Structure" under chapter
3.1.1 (Markup Structure) that are underscores ( _ ), periods ( . ) and
dashes ( - ) MUST NOT be used. 
This is the point. For the efficient development of interfaces and defining
methods it will be helpful to using this separators for building markups.
The markup should expanded and distinguishes between three elementary parts:
object, methods and directions by using any separation. 
The "object" denotes the entity which makes a method available (i.e.
PurchaseOrder). It includes the object class, property term and
representation term according the semantic guidelines in chapter 3.12. The
object is represented in UCC without any separators. 
The "method" represents the type of operation (i.e. "Create", "Delete",
"Modify").
And the "direction" denotes whether a component implements the interface as
a service (direction = In) or the component uses the interface for a call
(direction = "In" or "Out").
A preferred sign for the separation is the underscore ( _ ).
The markup structure would like to be then:
	<object>_<method>_<direction>
	Example: PurchaseOrder_Create_In
Within each part of the interface - object, method and direction - we use
the UCC (Upper Camel case) convention. The three parts are separated via an
underscore '_' for the following reasons:
	1.	In the development phase the software developer must define
the object and the method which is made available via the object. 
	2.	Any confusion concerning the object part or the method part
within an interface has to be avoided. I.e. using no separators in
'OrderItemDeleteIn' the object could be Order (method = ItemDelete) or the
object could be OrderItem (method = Delete).
	3.	Using the underscore results in no technical restrictions
concerning the proxy generation (for example in Java).
	4.	It is possible to implement check tools which check that two
underscores are used.
	5.	Reading an interface it is more easy to distinguish between
the three parts if there are separated using separators like '_'.

Regards,
	Gunther