Added doc for new kgtk_symbol and kgtk_type functions.
@@ -2170,7 +2170,9 @@ TO DO
| Function | Description |
|-----------------------|--------------------------------------------------------------------------------------------|
-| kgtk_literal(x) | Return True if 'x' is any KGTK literal. This assumes valid literals and only tests the first character (except for booleans). |
+| kgtk_literal(x) | Return True if `x` is any KGTK literal. This assumes valid literals and only tests the first character (except for booleans). |
+| kgtk_symbol(x) | Return True if `x` is a KGTK symbol. This assumes valid literals and only tests the first character (except for booleans). |
+| kgtk_type(x) | Return a type for the KGTK literal or symbol `x`, which will be one of `string`, `lq_string`, `date_time`, `quantity`, `geo_coord`, `boolean`, `typed_literal` or `symbol`. This assumes valid literals and only tests the first character (except for booleans). |
| kgtk_regex(x, regex) | Regex matcher that implements the Cypher `=~` semantics which must match the whole string. |
| kgtk_null_to_empty(x) | If `x` is NULL map it onto the empty string, otherwise return `x` unmodified. |
| kgtk_empty_to_null(x) | If `x` is the empty string, map it onto NULL, otherwise return `x` unmodified. |
