Similar to ANYDATA.ConvertXXXX built-ins, Oracle has provided ANYDATA.AccessXXXX built-ins to read the values of ANYDATA column or Variable.

The below example will show how to use AccessXXXX built-in with table column and PL/SQL variable.
Ex:
SELECT ANYDATA.AccessDate(id) from tab_anydata.
PL/SQL Block:
DECLARE
v_any ANYDATA;
BEGIN
v_any:= ANYDATA.convertNumber(1001);
DBMS_OUTPUT.PUT_LINE('Value in V_ANY variable is : ' v_any.AccessNumber());
v_any:=ANYDATA.convertDate('01-Jul-09');
DBMS_OUTPUT.PUT_LINE('Value in V_ANY variable is : ' v_any.AccessDate());
END;

Below are the list of Access built-ins, that are available with Oracle 9i.
MEMBER Function AccessBDouble(self IN ANYDATA) return BINARY_DOUBLE
MEMBER FUNCTION AccessBfile(self IN ANYDATA) return BFILE
MEMBER FUNCTION AccessBFloat(self IN ANYDATA) return BINARY_FLOAT
MEMBER FUNCTION AccessBlob(self IN ANYDATA) return BLOB
MEMBER FUNCTION AccessChar(self IN ANYDATA) return CHAR
MEMBER FUNCTION AccessClob(self IN ANYDATA) return CLOB
MEMBER FUNCTION AccessDate(self IN ANYDATA) return DATE
MEMBER FUNCTION AccessIntervalYM(self IN ANYDATA) return INTERVAL YEAR TO MONTH
MEMBER FUNCTION AccessIntervalDS(self IN ANYDATA) return INTERVAL DAY TO SECOND
MEMBER FUNCTION AccessNchar(self IN ANYDATA) return NCHAR
MEMBER FUNCTION AccessNClob(self IN ANYDATA) return NCLOB
MEMBER FUNCTION AccessNumber(self IN ANYDATA) return NUMBER
MEMBER FUNCTION AccessNVarchar2(self IN ANYDATA) return NVARCHAR2
MEMBER FUNCTION AccessRaw(self IN ANYDATA) return RAW
MEMBER FUNCTION AccessTimestamp(self IN ANYDATA) return TIMESTAMP
MEMBER FUNCTION AccessTimestampLTZ(self IN ANYDATA) return TIMESTAMP WITH LOCAL
MEMBER FUNCTION AccessTimestampTZ(self IN ANYDATA) return TIMESTAMP WITH
MEMBER FUNCTION AccessURowid(self IN ANYDATA) return UROWID DETERMINISTIC
MEMBER FUNCTION AccessVarchar(self IN ANYDATA) return VARCHAR
MEMBER FUNCTION AccessVarchar2(self IN ANYDATA) return VARCHAR2
Note: We don't have AccessXXXX built-in to read the values of Object, Collection and REF type.

I will explain you on how to read the Object, Collection and REF values stored in ANYDATA variable, in my next article.