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<s1 title="Interoperability">
        <s2 title="Problems">
           <p>In Version v1.0.4, there is one test case which fails (interop test for exclusive c14n). This is related to very esoteric node sets (The Y4 test vector from <jump href="http://www.w3.org/Signature/2002/02/01-exc-c14n-interop.html">the interop matrix</jump>). </p>
        </s2>
	<s2 title="Interoperability issues">
		<p>As it can be seen on the <jump href="http://www.w3.org/Signature/">working group homepage</jump>, there are some interoperability reports, namely for <jump href="http://www.w3.org/Signature/2000/10/10-c14n-interop.html">Canonical XML</jump>, <jump href="http://www.w3.org/Signature/2002/02/01-exc-c14n-interop.html">Exclusive Canonical XML</jump> and <jump href="http://www.w3.org/TR/xmldsig-core/2001/04/05-xmldsig-interop.html">XML Signature</jump>.</p>
		<p>Interoperability depends heavily on test vectors, this means that implementation A has to check whether the signatures from implementation B can be verified. For this purpose, we have a collection of different test vectors in our <code>data/</code> directory. The directory includes test vectors from</p>
	        <ul>
	        <li><jump href="http://www.baltimore.com/keytools/xml/index.html">Baltimore KeyTools XML</jump></li>
	        <li><jump href="http://jcewww.iaik.at/products/ixsil/index.php">IAIK IXSIL</jump></li>
	        <li><jump href="http://www.rsasecurity.com/products/bsafe/certj.html">RSA Security Cert-J</jump></li>
	        <li>The vectors from the <jump href="http://www.alphaworks.ibm.com/tech/xmlsecuritysuite">IBM alphaWorks XML Security suite</jump> could not been included in this distribution because of licensing issues. For some reasons which I do not understand, they copyrighted their test signatures which they have bundled with xss4j. If you want to include interop testing against IBM in your unit tests, simply do the following: Download <code>xss4j-20011029.zip</code> from the <jump href="http://www.alphaworks.ibm.com/aw.nsf/download/xmlsecuritysuite">alphaWorks download page</jump>. Copy all files from the <code>xss4j-20011029.zip#/xss4j/data</code> directory into the <code>xml-security/data/com/ibm/xss4j-20011029/</code> directory. If the <jump href="api/org/apache/xml/security/test/InteropTest.html">Interop</jump> class finds these files, the <code>org.apache.xml.security.test.interop.IBMTest</code> class is also executed during unit interop tests. </li>
	        </ul>
	</s2>
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