Namespace validation is not done

[edi9999]

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• Have you included sample input, output, error, and expected output?
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Description

Input

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
      <pic:pic>
      </pic:pic>
</w:document>

Code

const fastXmlParser = require("fast-xml-parser");
const result = fastXmlParser.validate(str);
// result is true, but I expect it to be an error object.

Expected behavior

I would expect to see an error telling that the "pic" namespace was not defined in the document.

This is what is shown when using : https://xmlvalidation.com/

Would you like to work on this issue?

• Yes, if you tell me that you're ok for it to be done and if you help me locate the changes to be done
• No

[amitguptagwl]

Yes, I hope it'll not be tuff to implement.

In validator.js, when we extract attributes name to validate them, we can extract NS to some object.

fast-xml-parser/src/validator.js

Line 80 in 0f1443a

const result = readAttributeStr(xmlData, i);

We're already stacking tagName. Instead, we can stack a small object which will contain tagName and NS array attached with that tag.

fast-xml-parser/src/validator.js

Line 129 in 0f1443a

tags.push(tagName);

Now when we're popping the tagName to verify the closing tag, we can remove those NS from the NS object that we created in starting.

fast-xml-parser/src/validator.js

Line 106 in 0f1443a

const otg = tags.pop();

Validation
Now when we extract tag name or attribute name we can validate if the NS is bound or not.

fast-xml-parser/src/validator.js

Line 129 in 0f1443a

tags.push(tagName);

fast-xml-parser/src/validator.js

Line 298 in 0f1443a

function validateAttributeString(attrStr, options) {

[kk-08]

Added a PR for this: #275
PS: Blocked due to this. Would love to see this in the master soon.