It's possible to work with webdynpro development in parallel.
In my experience you would like to avoid the situation when you need to merge a webdynpro application. Instead you would have a more strict discipline on checking in and updating code for all developers involved.
Webdynpro generates a lot of meta data stored in xml-files (even the java-source code is stored in xml-files).
Since NWDI (and most diff tools) don't handle xml-files, and the generation of the meta data isn't defined, you would probably get a diff from two versions even if there is no difference.
For instance, if you add 2 attributes to a context, then remove one of them and then add the it again, you could end up with two completely different meta data files, even if the context is the same with 2 attributes.
This gets even more complex when you are working with dependencies between components, and practically useless for larger project (if you aren't reading XML fluently )
For the purpose of version control, any source control system such as CSV would do fine. Webdynpro generates everything from it's meta data-files, so you would only need to version control these.
However you would miss the DC concept witch is very central in SAP Net weaver. A Software Component contains several Development Components, and is a concept for keeping track of version dependencies in a landscape.
If you don't want to use a NWDI (for some reason) you wouldn't know if you have the right versions of all dc's deployed in your whole landscape.
I recommend you to use NWDI. Dependencies between different dc's would be too complex to keep track of in the end, so as a future strategy your project team would benefit more by using NWDI.
I also recommend that you don't develop in parallel in the same file at the same time (i.e. in one Webdynpro view or webdynpro controller).
Create more independent webdynpro dc's and create dependencies between them, rather than one big webdynpro project with a lot of components in it.
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