The Textile Markup Reference for Textpattern
CSS classes and IDs are enclosed in parentheses (). just after phrase modifiers or block modifiers.
1) An id with a paragraph:
p(#my-paragraph). This is a paragraph that has an id.
2) Both a class and an id:
div(myclass#myid). This div has both a CSS class and an id.
3) An emphasized phrase with an id:
This *(#special-phrase)emphasized phrase* has an id.
code into the box above.