Question on role creation for editing xml

[jiaqya]

i would like one user to edit xml code or change query on the panels/dashboard of his app alone.

what is the capabilities to choose for enabling this for the user.
and how to apply this only to a particular app.

[sumanssah]

Edit permission to the app, dashboard, search, etc is based on user roles and a role can have more than 1 user.
Would be difficult to enable such condition where user can only edit its own dashboard.

[jiaqya]

yes, this is for one particular user. just need this user to edit his own app ..
what are the capabilities to choose so he can edit the app.