rammar-production-PN_CHARS_U">PN_CHARS_U</a> <code>|</code> "<code class="grammar-literal">:</code>" <code>|</code> <code>[</code> <code class="grammar-literal">0-9</code><code>]</code>  <code>|</code> <a href="#tg-grammar-production-PLX">PLX</a><code>)</code>  <code>(</code> <code>(</code> <a href="#tg-grammar-production-PN_CHARS">PN_CHARS</a> <code>|</code> "<code class="grammar-literal">.</code>" <code>|</code> "<code class="grammar-literal">:</code>" <code>|</code> <a href="#tg-grammar-production-PLX">P