Changing style names
When changing style style names, ensure that these names are not used in scripts, for style application by macros and hot-keys, or update them accordingly. If a script calls a style by its name and you change the name, the style application will fail. See also Styles and scripting.
Changing tag name
•If a style was never applied on text: Just do it.
•If a style was applied on text and it is not possible to replace all occurrences: Don't do it. All the stories which contain original tag will not be justifiable any more, i.e. will produce a justification error on each attempt of text justification. Furthermore, opening a page which contains linked stories, which in turn contain tags with old names, the justification errors will appear for each such text.