Specials
Specials are constants set by a containing element.
Examples of specials include the error caught by a <try>
element, or the attributes and children passed to a function.
<special>
The <special>
element is used to retrieve the value of a special.
If the special of the requested name, the Special `{name}` not found
error is thrown.
Attributes
name
(string, optional): The name of the special to retrieve.
Children
If the name
attribute has been provided, <special>
does not accept any children. The value of the special with the given name is returned.
If the name
attribute has not been provided, <special>
must have a single child, which is evaluated and converted to a string. This child is used as the name of the special to retrieve.