No, but the W3C Validation Service validates XML against a DTD, I think. I don't know if it can validate against a schema.

Edit: a quick search indicates that there are several NPM packages which will do XML validation. You could write an NPM script that watches for changes to the XML and runs validation, and run that script through the NPM scripts explorer in VSCode.

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Not purely XML editors, but feature-rich text editors I love include: Sublime Text 2 Notepad++ Programmer's Notepad More on reddit.com

Very nice, very helpful. I would point out the use add-member for $script:validationresults is deprecated (maybe only for aesthetics?), as PS v3 allows something like this:

$script:validationresults = New-Object PSObject -property @{
  XMLFile = $xmlFile;
  ValidationComplete = $true;
  isValid = $true; 
  Errors = @();
}

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Talking about XML validation: both DTD and XSD are horrible. DTD is very simplistic and forces a specific order of elements, and XSD is bloat and impossible to write. What happened to RelaxNG? That was my favourite. You can write in easily readable compact form, transform it to XML which can be used for validation in XML::LibXML. EDIT: just a clarification: as Gabor Szabo's newsletter summarized your article with "not every liked it (sic)" with a link to this comment section. That's not the case! I liked your article! It's just that I'm not particularly fond of XML. When I ask people why they use it, I often get: "You can validate it!" My next question of course is what they use for validation, on which I usually get a blank stare, which I interpret as: "we could if we wished to so", so the question of which they use - DTD or XSD - answered itself. More on reddit.com