SAXParser reading external Schema - how to add addtional namespaces

Question

Hi,
I have an application where the XML-Schema has to be read from somewhere else if the XML file does not have a reference to a Schema.
Usually, my XML-file starts with:
<ODM xsi:schemaLocation="http://www.cdisc.org/ns/odm/v1.2 ODM1-2-0.xsd" xmlns="http://www.cdisc.org/ns/odm/v1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ...>
Remark the extra namespace for xsi.
I am using the following code:
parser.setFeature("http://xml.org/sax/features/validation",true); // validation
parser.setFeature("http://apache.org/xml/features/validation/schema",true); // against Schema
parser.setProperty("http://apache.org/xml/properties/schema/external-schemaLocation", "http://www.cdisc.org/ns/odm/v1.2 file://C:/CDISC_ODM_Checker_testfiles/ODM1.2/ODM1-2-0.xsd");
etc...
Although I am sure that the file location is correct, I get the following error when parsing:
org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'ODM'.
My Schemafile looks like:
<xs:schema targetNamespace="http://www.cdisc.org/ns/odm/v1.2" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.cdisc.org/ns/odm/v1.2" elementFormDefault="qualified" attributeFormDefault="unqualified">
     <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>
     <xs:import namespace="http://www.w3.org/2000/09/xmldsig#" schemaLocation="http://www.w3.org/TR/xmldsig-core/xmldsig-core-schema.xsd"/>
I am wondering what is wrong.
Does it have to do with the usual xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" that I usually have in the XML file ? Should I also tell the parser about xsi ?
Or is there anything very obvious I oversee ?
Parser is Xerces-2-5-0, Operating System is Windows 2000.
Any help is welcome
Jozef Aerts
XML4Pharma

Answer 1

Hi,
Many thanks for all the suggestions !
The problem remains that I am only allowed to make changes in the Java code, not in the XML-Schema or in the incoming XML file.
To be more specific, the file can come in in 2 separate ways. The first way is :
<ODM xsi:schemaLocation="http://www.cdisc.org/ns/odm/v1.2 ODM1-2-0.xsd" xmlns="http://www.cdisc.org/ns/odm/v1.2" xmlns="http://www.cdisc.org/ns/odm/v1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Description="CDISC ODM version 1.2.2 format" FileType="Transactional" Granularity="All" FileOID="987-654-321" CreationDateTime="2002-04-29T11:07:23-05:00"> ... </ODM>
No problem to parse this when the odm1-2-0.xsd is in the same directory.
However, in some cases, the file can come in as:
<ODM Description="CDISC ODM version 1.2.2 format" FileType="Transactional" Granularity="All" FileOID="987-654-321" CreationDateTime="2002-04-29T11:07:23-05:00">
So, no references to schema location nor namespaces.
In the latter case, I need to assign an external schema file (which can be in another directory as the xml file) and tell the SAXParser about the namespaces. It's the second thing that I do not know how to do.
I do not want to edit the incoming xml file if possible, but just tell the parser about the namespaces.
Many thanks in advance
Jozef Aerts
XML4Pharma