proper IDs for apparatus parts

[thvitt]

• one unique ID per <app>
• unique IDs per referenced <seg> to allow for parallel highlighting
• IDs should be predictable and stable since they are also needed for Appendix of notes on app entries & textual issues #280
• duplicates could be eliminated duplicate app entries #191

[thvitt]

Calculation an ID base for an f:ins (from app*norm.xml) works as follows:

• value of n attribute of that ins
• take the first non-empty of:
  • the text value of the f:ins, converted to lower case, removing everything that is neither a letter, a digit or _
  • the value of the place attribute
• join both with a .
  For <app> elements, we take the base ID of the first f:ins in the app and prefix it with app.. For <seg> elements, we take the base id of the f:ins corresponding to the <seg> and prefix it with seg..

[gerritbruening]

Confused the repos in commit message, sorry.

[thvitt]

I guess you didn't want to reopen this?

[gerritbruening]

Ah, now I see that this was legitimatly closed before, sorry!