CODEWITHSUNDEEP
javaxmlvalidationxml-namespacesxsd-validation
taranion
taranion

Reputation: 671

Validate XML with multiple namespace in Java

I am trying to validate a XML document that uses multiple namespaces. I want to embed tags of the secondary namespace within a document of the primary namespace. The main/primary namespace does not "know" of the extension/secondary namespace.

test.xml

<?xml version="1.0" encoding="UTF-8"?>
<book
    xmlns    ="MyMain_FPI"
    xmlns:ns2="MyExtension_FPI"
    >
    <ns2:playmusic/>
    <chapter/>
    <chapter/>
</book>

The Java code for validation is the following:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);

SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = schemaFactory.newSchema(new Source[] {
    new StreamSource(new FileInputStream("main.xsd")),
    new StreamSource(new FileInputStream("extension.xsd")),
});
factory.setSchema(schema);

DocumentBuilder builder = factory.newDocumentBuilder();

Document doc = builder.parse(new File("test.xml"));

As you can see, I directly add the XSD files to the DocumentBuilderFactory. Those files are:

main.xsd

<xs:schema 
  xmlns:xs="http://www.w3.org/2001/XMLSchema" 
  xmlns="MyMain_FPI"
  targetNamespace="MyMain_FPI"
    elementFormDefault="qualified">
  <xs:element name="book">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" ref="chapter"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="chapter">
    <xs:complexType/>    
  </xs:element>
</xs:schema>

extension.xsd

<xs:schema 
  xmlns:xs="http://www.w3.org/2001/XMLSchema" 
  xmlns="MyExtension_FPI"
  targetNamespace="MyExtension_FPI"
    elementFormDefault="qualified">
  <xs:element name="playmusic">
  </xs:element>
</xs:schema>

The error I get when executing the code above is

[Error] test.xml:6:18: cvc-complex-type.2.4.a: Ungültiger Content wurde beginnend mit Element 'ns2:playmusic' gefunden. '{"MyMain_FPI":chapter}' wird erwartet.

Meaning, that is unexpected within the main namespace - which is understandable, since the element itself is unknown in that namespace. I expected that elements of the extension namespace are ignored when validating the document again the main namespace and vice versa - meaning that I can embed documents following the extension namespace within the main namespace. But that is obviously not working.

What did I miss?

Upvotes: 3

Views: 2212

Answers (1)

Daniel Moses
Daniel Moses

Reputation: 5858

Your main.xsd is explicit in what is allowed in the book element. If you want to allow any additional element, you'll need to state that in the main.xsd. After which you can add any extension XSDs you want. see https://www.w3.org/TR/xmlschema-0/#any.

new main.xsd

<xs:schema 
xmlns:xs="http://www.w3.org/2001/XMLSchema" 
xmlns="MyMain_FPI"
targetNamespace="MyMain_FPI"
  elementFormDefault="qualified">
<xs:element name="book">
  <xs:complexType>
    <xs:sequence>
      <xs:any minOccurs="0" maxOccurs="unbounded" />
      <xs:element maxOccurs="unbounded" ref="chapter"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>
<xs:element name="chapter">
  <xs:complexType/>    
</xs:element>
</xs:schema>

Upvotes: 2

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