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HTML Guide for xml 1.0

Attribute with the local name “xmlns:serif” is not serializable as XML 1.0

attribute
serializable
xml 1.0
xmlns
affinity designer

The attribute xmlns:serif is not valid. Check this guide for more information on this issue.

Attribute “X” is not serializable as XML 1.0.

attribute
serializable
xml 1.0

An attribute could not be parsed from the HTML input, probably due to a typo. Check this guide for a related HTML issue.