function extAttrListItems(tokeniser) {
  for (const syntax of extAttrValueSyntax) {
    const toks = tokens(tokeniser, syntax);
    if (toks.length) {
      return toks;
    }
  }
  tokeniser.error(
    `Expected identifiers, strings, decimals, or integers but none found`
  );
}
This will allow a set of extended attribute values to be parsed.
@param {import("../tokeniser.js").Tokeniser} tokeniser