Validate XML with XSD

Question

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
with the partitioning, real application clusters, olap, data mining
and Real Application Testing options
Working with relational tables containing clob type columns (no XMLDB available) I'm not able to set up a simple validation example as below (supposed to return 1 confirming a successful validation).
declare
  xmldoc xmltype;
  sb_xml xmltype;
  valid_ number;
  xmlxsd varchar2(4000) := q'~<?xml version="1.0" ?>
                              <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
                              <xs:element name="greeting" type="xs:string" />
                              </xs:schema>~';
  xmlxml varchar2(32767) := q'~<?xml version="1.0" ?><greeting>"HELLO !"</greeting>~';
begin
  xmldoc := xmltype(xmlxml);
  sb_xml := xmldoc.createschemabasedxml();
  valid_ := sb_xml.isschemavalid(xmlxsd);
  dbms_output.put_line('IsSchemaValid (0=false,1=true): ' || to_char(valid_));
end;Thanks in advance for any kind of help provided
Etbin

Answer 1

no XMLDB availablenot sure if it will work without xmldb, but you might try to use java for schema validation:
SQL> CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED "SchemaUtil"
  2  as
  3
  4  import oracle.xml.parser.schema.*;
  5  import oracle.xml.parser.v2.*;
  6  import oracle.sql.CHAR;
  7  import java.io.*;
  8
  9  public class SchemaUtil
10  {
11     public static String validation(CHAR xml, CHAR xsd)
12     throws Exception
13     {
14        //Build Schema Object
15        XSDBuilder builder = new XSDBuilder();
16        byte [] docbytes = xsd.getBytes();
17        ByteArrayInputStream in = new   ByteArrayInputStream(docbytes);
18        XMLSchema schemadoc = (XMLSchema)builder.build(in,null);
19        //Parse the input XML document with Schema Validation
20        docbytes = xml.getBytes();
21        in = new ByteArrayInputStream(docbytes);
22        DOMParser dp  = new DOMParser();
23        // Set Schema Object for Validation
24        dp.setXMLSchema(schemadoc);
25        dp.setValidationMode(XMLParser.SCHEMA_VALIDATION);
26        dp.setPreserveWhitespace (true);
27        StringWriter sw = new StringWriter();
28        dp.setErrorStream (new PrintWriter(sw));
29        try
30        {
31           dp.parse (in);
32           sw.write("The input XML parsed without errors.\n");
33        }
34        catch (XMLParseException pe)
35        {
36             sw.write("Parser Exception: " + pe.getMessage());
37          }
38        catch (Exception e)
39          {
40             sw.write("NonParserException: " + e.getMessage());
41          }
42          return sw.toString();
43     }
44   }
45  /
Java created.
SQL>
SQL> create or replace function schemavalidation(xml in varchar2,xsd in varchar2)
  2  return varchar2 is language java name 'SchemaUtil.validation(oracle.sql.CHAR,oracle.sql.CHAR)
  3                   returns java.lang.String';
  4  /
Function created.
SQL>
SQL> select schemavalidation('<?xml version="1.0" ?><greeting>"HELLO !"</greeting>',
  2                           '<?xml version="1.0" ?>
  3                          <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  4                          <xs:element name="greeting" type="xs:string" />
  5                          </xs:schema>') schemavalidation from dual
  6  /
SCHEMAVALIDATION
The input XML parsed without errors.
SQL>