The attribute on the element is not defined in the DTD/Schema
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Hello, when I try to validate my file i get this error. I am new to xml files and could use help correcting the beginning of my file.

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It sounds like you are using XML Tools (or similar) plugin for Notepad++. It is trying to tell you about an error in your XML and/or the DTD/Schema that it’s linking to.
This Forum is about Notepad++ itself, and cannot be an expert in – and should not be expected to provide help with – every possible thing you could type in Notepad++ … be it XML/XSD, HTML, C++, Python, JavaScript, cookie recipes, …
But let me google that for you – from what I can tell from those answers, it looks like your XSD file doesn’t define the attribute
noNamespaceSchemaLocationfor thehci_dataelement. I would start my research there, if I were you.
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