Скачать или смотреть Understanding xs:assert in XSD 1.1: Troubleshooting Common Validation Errors

Discover how to resolve the `Assertion evaluation did not succeed` error in XSD 1.1 and correctly implement `xs:assert` in your schema validation.
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Understanding xs:assert in XSD 1.1: Troubleshooting Common Validation Errors

If you are working with XML Schema Definitions (XSD) and recently started using the xs:assert feature in XSD 1.1, you might have encountered some challenges. One of the most common errors is the assertion evaluation failure that states, "Assertion evaluation did not succeed." In this guide, we will address this issue and guide you on how to properly utilize the xs:assert feature alongside the XSD to ensure your XML files validate correctly.

The Problem: Assertion Evaluation Failure

When validating your XML against an XSD, you may receive an error message similar to the following:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that your XSD has an assertion condition that is not being satisfied by your XML data. In particular, this issue arises in relation to the condition checking the value of the MsgId element, which is expected to equal 'ABC'.

Example Code Snippets

The original XSD attempts an assertion like this:

[[See Video to Reveal this Text or Code Snippet]]

And here’s a sample of the XML it is trying to validate against this assertion:

[[See Video to Reveal this Text or Code Snippet]]

The Solution: Correcting Namespace Issues

To fix this validation issue, you must ensure that both the XML and the XSD are correctly aligned in terms of namespaces. The error you are encountering typically stems from two common oversight areas:

XML Not in Target Namespace: Your XML declaration needs to specify that it belongs to the target namespace defined in your XSD.

Assertion References: The assertion is trying to reference MsgId without the appropriate namespace context, which leads to the failure in evaluation.

Revised XML Example

To resolve the namespace issue, update your XML as follows:

[[See Video to Reveal this Text or Code Snippet]]

Revised XSD Example

Ensure your XSD is set up correctly to recognize these namespaces:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By ensuring that both your XML document and your XSD schema are aligned with regard to namespaces, you can effectively utilize the xs:assert functionality. This will help you avoid assertion evaluation issues and create more robust XML validations.

If you're still encountering issues, double-check the namespace declarations and assertion tests to make sure they are correctly set up. Happy XML validating!