Newbie - how to validate xml file?

[martin waller]

Hi,

I'm trying to work out how to validate xml files with a simple schema 
I've written and I'm clearly missing something.

Here's the code that I'm using to do the validation:

      //initialisation stuff...

       XercesDOMParser parser;
       parser.setValidationScheme(XercesDOMParser::Val_Always);
       parser.setDoNamespaces(true);
       parser.setDoSchema(true);
       
parser.setExternalNoNamespaceSchemaLocation(testschema.c_str());//the 
schema..
       try
       {
           parser.parse(testfile.c_str());       
       }
       catch (const XMLException& toCatch) {
           char* message = XMLString::transcode(toCatch.getMessage());
           cout << "Exception message is: \n"
                << message << "\n";
           XMLString::release(&message);           
       }
       catch (const DOMException& toCatch) {
           char* message = XMLString::transcode(toCatch.msg);
           cout << "Exception message is: \n"
                << message << "\n";
           XMLString::release(&message);           
       }
       catch (...) {
           cout << "Unexpected Exception \n" ;           
       }

       try
       {
           parser.parse(testfile2.c_str());       
       }
       catch (const XMLException& toCatch) {
           char* message = XMLString::transcode(toCatch.getMessage());
           cout << "Exception message is: \n"
                << message << "\n";
           XMLString::release(&message);           
       }
       catch (const DOMException& toCatch) {
           char* message = XMLString::transcode(toCatch.msg);
           cout << "Exception message is: \n"
                << message << "\n";
           XMLString::release(&message);           
       }
       catch (...) {
           cout << "Unexpected Exception \n" ;           
       }

'testfile' should be valid, and testfile2 isn't, but when I run the 
program 'nothing happens' (it runs, no exceptions, no complaints).

Here's the xsd file:
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";>
<xsd:element name="componentDefinition">
   <xsd:complexType>
       <xsd:all>
           <xsd:element name="refDes" type="xsd:string" minOccurs="0" 
maxOccurs="1"/>
           <xsd:element name="packageName" type="xsd:string" 
maxOccurs="1"/>
           <xsd:element name="partNumber" type="xsd:string" 
minOccurs="0" maxOccurs="1"/>
           <xsd:element name="power" type="xsd:float" maxOccurs="1"/>
           <xsd:element name="powerUnits" type="xsd:string" 
minOccurs="0" maxOccurs="1"/>
           <xsd:element name="zRot">
               <xsd:simpleType>
                   <xsd:restriction base="xsd:string">
                       <xsd:enumeration value="0"/>
                       <xsd:enumeration value="90"/>
                       <xsd:enumeration value="180"/>
                       <xsd:enumeration value="270"/>
                   </xsd:restriction>
               </xsd:simpleType>
           </xsd:element>
           <xsd:element name="length" type="xsd:float" maxOccurs="1"/>
           <xsd:element name="width" type="xsd:float" maxOccurs="1"/>
           <xsd:element name="lengthUnits" type="xsd:string" 
minOccurs="0" maxOccurs="1"/>
           <xsd:element name="height" type="xsd:float" maxOccurs="1"/>
           <xsd:element name="heightUnits" type="xsd:string" 
minOccurs="0" maxOccurs="1"/>
       </xsd:all>                       
       <xsd:element name="property" minOccurs="0" maxOccurs="unbounded">
           <xsd:complexType>
               <xsd:sequence>
                   <xsd:element name="propName" type="xsd:string"/>
                   <xsd:element name="propValue" type="xsd:string"/>
                   <xsd:element name="propUnits" type="xsd:string" 
minOccurs="0"/>
               </xsd:sequence>
           </xsd:complexType>
       </xsd:element>       
   </xsd:complexType>
</xsd:element>
</xsd:schema>

Here's the invalid xml file testfile2):
<?xml version="1.0" encoding="utf-8" ?>
<componentDefinition xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance";
xsi:noNamespaceSchemaLocation="CompDef.xsd">
<refDes>U1</refDes>
<rubbish>Test01-02-03</rubbish>
<power>3</power>
<powerUnits>W</powerUnits>
<zRot>0</zRot>
<length>100</length>
<width>50</width>
<lengthUnits>mm</lengthUnits>
<height>4</height>
<heightUnits>mm</heightUnits>
</componentDefinition>



I'm not quite sure what to expect when it parses the invalid file? It 
seems to do it  OK then just returns normally. Shuld it throw an 
exception or what? I'm a bit overwhelmed by the docs...like I say, I'm 
new to this so please treat me as a beginner...

Martin