• The fresh new lexical area from an icon place is actually a low-blank group of Unicode profile chain.
• The identifier out of an icon room are a series from Unicode emails you to definitely means a complete IRI [RFC-3987].
• Additional symbol rooms cannot show an equivalent identifier.

To simplify the language, we will often use symbol space identifiers to refer to the actual symbol spaces (for instance, we may use “symbol space xs:string” instead of “symbol space identified by xs:string“).