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AWS Polly InvalidSsmlException

The provided SSML input is not valid.

Understanding AWS Polly

AWS Polly is a service provided by Amazon Web Services that turns text into lifelike speech, allowing developers to create applications that can talk. It uses advanced deep learning technologies to synthesize speech that sounds like a human voice. AWS Polly is commonly used in applications that require voice interaction, such as virtual assistants, e-learning platforms, and more.

Recognizing the Symptom: InvalidSsmlException

When using AWS Polly, you might encounter the InvalidSsmlException error. This error indicates that there is an issue with the Speech Synthesis Markup Language (SSML) input provided to AWS Polly. The symptom is typically an error message stating that the SSML input is not valid, preventing the text-to-speech conversion from proceeding.

Exploring the Issue: Invalid SSML Input

The InvalidSsmlException occurs when the SSML input does not adhere to the required specifications. SSML is a markup language used to control various aspects of speech synthesis, such as pronunciation, volume, and speed. If the SSML is malformed or contains unsupported tags, AWS Polly will not be able to process it, resulting in this exception.

Common Causes of Invalid SSML

  • Missing or mismatched tags.
  • Unsupported SSML tags or attributes.
  • Incorrect nesting of SSML elements.

Steps to Fix the InvalidSsmlException

To resolve the InvalidSsmlException, follow these steps:

1. Validate Your SSML

Ensure that your SSML is well-formed. You can use online validators like W3Schools XML Validator to check for syntax errors.

2. Adhere to SSML Specifications

Make sure your SSML follows the W3C SSML Specification. This includes using supported tags and attributes.

3. Check for Unsupported Tags

Review the AWS Polly SSML Documentation to ensure that all tags used are supported by AWS Polly.

4. Test with Simple SSML

Start with a basic SSML structure and gradually add complexity. This helps identify which part of the SSML is causing the issue.

Conclusion

By ensuring your SSML input is valid and adheres to the specifications, you can effectively resolve the InvalidSsmlException in AWS Polly. Proper validation and adherence to guidelines will help you leverage AWS Polly's capabilities without encountering errors.

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