Specify how default identifiers (id fields) are calculated

[bruderol]

proposal:

only following characters are allowed: A-Z,a-z,0-9, - _ + and no spaces!

calculation of default id from name/value:

1. All unallowed characters are replaced with _
2. A sequence of more than one is reduced to one single
3. I think we should remove leading and trailing _ from generated default ids

This has even the advantage, that when somebody is using a path, e.g. "base/bla" or "/base/bla/" or "base/bla/", that this three examples are all 3 mapped to the same id "base_bla". And "http://www.scenarioo.org" becomes "http_www_scenarioo_org"

Open points:

• What about other often used characters that could be useful: ä ö ü . : @ # ...
• We should also provide a simple command line skript that can be used in build scripts to calculate ids from object names, where needed (e.g. for calculating the link to a concrete build in scenarioo)

[bruderol]

Decission:

• we only allow following characters: A-Z,a-z,0-9, - _
• Spaces are replaced by -
• \ and / are replaced by -
• other special characters may be replaced, to be defined later.
  • ä, ö, ü will be replaced by ae, oe, ue
  • other umlaute/special characters replaced by a,o,u (to be defined in details)
  • to see what libraries we use later
• all characters not allowed and not having a special replacement will be replaced by -
• no trimming of multiple dashes

[bruderol]

what we finally agreed upon:

• diacritics are just replaced by a, o, e ...
• Slashes (\ and /) are both replaced by _(because that was what the old sanitizer did allready for names before, that were used as ids so far)
• Spaces and all other unallowed characters are replaced by -
• no trimming of multiple dashes.

[bruderol]

that is what the reference implementation does, I consider this as closed