[xwiki-devs] XWiki tags specification

Hi devs, Do we have a specification for what a tag is inside XWiki? On http://extensions.xwiki.org/xwiki/bin/view/Extension/Tag+Application tags are defined as keywords but no constraints are specified. I'd like to enforce this two constraints on tags: * tags can't have leading and trailing white space characters * tags' case is saved but case is ignored when comparing two tags (once you defined a tag "news" you can't define a new tag "News"; the existing tag is reused; tag's case is used only for display) Optionally, we could enforce that tags can't contain white spaces. WDYT? If no one is against it then I'd like to change the UI to apply these constraints. Thanks, Marius