1. Enable users to set `scope`, `exclude`, `include` once for a `snippet` file to make it available for all `<item>` in it. 2. Enable users to specify `language` with abbr, such as `py` for `python` and `js` for `javascript`.
scope,exclude,includeonce for asnippetfile to make it available for all<item>in it.languagewith abbr, such aspyforpythonandjsforjavascript.