The full message displayed in VSCode may be different from elsewhere:
White space is required before the attribute default in the declaration of attribute "x" for element "y". xml(MSG_SPACE_REQUIRED_BEFORE_DEFAULTDECL_IN_ATTDEF)
This simple one-line change appends the space character required to avoid that error.
**Note:** This should not be modified into a change on the `joinAlts` Collector which surrounds values in parentheses. That Collector is used elsewhere where regex syntax is applied immediately after. See line 298. That asterisk cannot be separated from the values with a space. The space must only be applied to line 327.