BPM Workspace Customization & User Interface: Best Practice Question

Hi All,
This is our first BPM Project in house and we are on Oracle BPM 11g.
The business process involves request for approval for a permit from a public user and internal users need to approve/reject the same. Pretty simple and straightforward so far.
But we are now having lots of questions wrt to user interface.
1. Work Space Changes.
If we develop this application completely in Oracle BPM, the outside user (general public) will also see the 'workspace' with its current interface. It would be impossible to handle user training on this interface for a simple Joe Bloe, who may not be computer savvy) So the requirement documents demand that the look and feel of the outside users should be totally different than what the workspace provides. They want this to be customized in such a way that iit would strip all of the default lay out (left navigation bar, and get rid of the upper section completely. with its list of tabs) and also to modify the task list that appears below).
We have figured out how to achieve this (by modifying the workspace .jar files and recompiling the same), but is this a good approach? What happens if we are developing a brand new application on the BPM in our shop? This change will affect that application as well, as the workspace is shared and common to all the apps? I want some of you experts to let us know, your thoughts on this. If this is not a recommended practice, what would be best way to achieve what we want using Oracle BPM? (Where we want a simple intuitive user interface, without the default add ons that comes with the work space)...
2. What would be the best method to create a user registration page (where a user creates his own login and password and maintains his account) for an application using the BPM ? Right now we are thinking this should be in either a ADF page/ JSP page or (worst case a PL SQL cartridge) that can be launched on the browser, which will be open and does not require any kind of authentication to access. Is this a good practice or recommended one? Or are we missing out on something within BPM application itself, that we are not aware of and that would let us do this?
3. Also, if we go with an external ADF application for the 'public' user interface developement, then how can we (or can we) leverage the BPM's internal storage for the submitted data from the payload? I understand that it stores this information currently on the server 'soa infra' tables some where? Thru an external ADF app, can we write into these tables (Is this recommended or just sounds plain ridiculous)???
Knowing answers to these questions will help us decide, if this is the right tool for the job at hand.
Appreciate your time and xpertise.
Thanks
SR

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I know this sounds like a specific apprequirement,
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>
I do a lot of database work though. And for that
null means something specific.Sure, return null if you have a context where null
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result at all. But as I said before its's best to
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Exactly what part of that didn't you follow?
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Best Practice Question

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core is my DWH shema.
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thanks and regards
Andreas

Andreas,
I guess the correct is depends... Without kidding, are you planning to use a flat star table for this dimension? If that is the case you would be joining the sources together and loading this into the table.
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Hi Eric,
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Robin

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1:
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BPM Workspace Customization & User Interface: Best Practice Question

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