Having trouble with xml package in "Building Oracle Xml Applications"

Question

I have modified the xml package found in Building Oracle XML Applications chapter 5 to exclude everything but the CLOB function, see Package below. When compiling the package body I am getting the following error.
SQL> @xml_body
35 /
Warning: Package Body created with compilation errors.
SQL> show errors
Errors for PACKAGE BODY XML:
LINE/COL ERROR
19/5 PL/SQL: Statement ignored
19/15 PLS-00382: expression is of wrong type
SQL>
The error occurs at this line in the xml_body package.
retDoc := xmlparser.getDocument(parser);
I am new to Oracle and any help would be appreciated.
CREATE OR REPLACE PACKAGE xml AS
-- Parse and return an XML document
FUNCTION parse(xml CLOB) RETURN xmldom.DOMDocument;
-- Free the memory used by an XML document
PROCEDURE freeDocument(doc xmldom.DOMDocument);
END;
CREATE OR REPLACE PACKAGE BODY xml AS
parse_error EXCEPTION;
PRAGMA EXCEPTION_INIT(parse_error,-20100);
-- Parse functions parse an XML document and return a handle to
-- the in-memory DOM Document representation of the parsed XML.
-- Call freeDocument() when you're done using the document returned
-- by the function.
FUNCTION parse(xml CLOB) RETURN xmldom.DOMDocument IS
retDoc xmldom.DOMDocument;
parser xmlparser.Parser;
BEGIN
IF xml IS NULL THEN RETURN NULL; END IF;
parser := xmlparser.newParser;
xmlparser.parseCLOB(parser,xml);
retDoc := xmlparser.getDocument(parser);
xmlparser.freeParser(parser);
RETURN retDoc;
EXCEPTION
WHEN parse_error THEN
xmlparser.freeParser(parser);
RETURN retDoc;
END;
-- Free the Java objects associated with an in-memory DOM tree
PROCEDURE freeDocument(doc xmldom.DOMDocument) IS
BEGIN
xmldom.freeDocument(doc);
END;
END;
null

Answer 1

I have modified the xml package found in Building Oracle XML Applications chapter 5 to exclude everything but the CLOB function, see Package below. When compiling the package body I am getting the following error.
SQL> @xml_body
35 /
Warning: Package Body created with compilation errors.
SQL> show errors
Errors for PACKAGE BODY XML:
LINE/COL ERROR
19/5 PL/SQL: Statement ignored
19/15 PLS-00382: expression is of wrong type
SQL>
The error occurs at this line in the xml_body package.
retDoc := xmlparser.getDocument(parser);
I am new to Oracle and any help would be appreciated.
CREATE OR REPLACE PACKAGE xml AS
-- Parse and return an XML document
FUNCTION parse(xml CLOB) RETURN xmldom.DOMDocument;
-- Free the memory used by an XML document
PROCEDURE freeDocument(doc xmldom.DOMDocument);
END;
CREATE OR REPLACE PACKAGE BODY xml AS
parse_error EXCEPTION;
PRAGMA EXCEPTION_INIT(parse_error,-20100);
-- Parse functions parse an XML document and return a handle to
-- the in-memory DOM Document representation of the parsed XML.
-- Call freeDocument() when you're done using the document returned
-- by the function.
FUNCTION parse(xml CLOB) RETURN xmldom.DOMDocument IS
retDoc xmldom.DOMDocument;
parser xmlparser.Parser;
BEGIN
IF xml IS NULL THEN RETURN NULL; END IF;
parser := xmlparser.newParser;
xmlparser.parseCLOB(parser,xml);
retDoc := xmlparser.getDocument(parser);
xmlparser.freeParser(parser);
RETURN retDoc;
EXCEPTION
WHEN parse_error THEN
xmlparser.freeParser(parser);
RETURN retDoc;
END;
-- Free the Java objects associated with an in-memory DOM tree
PROCEDURE freeDocument(doc xmldom.DOMDocument) IS
BEGIN
xmldom.freeDocument(doc);
END;
END;
null