Naming rules violated

[PiRomant]

XML Naming Rules

XML elements must follow these naming rules:

• Element names are case-sensitive
• Element names must start with a letter or underscore
• Element names cannot start with the letters xml (or XML, or Xml, etc)
• Element names can contain letters, digits, hyphens, underscores, and periods
• Element names cannot contain spaces
• Any name can be used, no words are reserved (except xml).

https://www.w3schools.com/xml/xml_elements.asp#XML%20Naming%20Rules:~:text=can%20have%20attributes.-,XML%20Naming%20Rules,-XML%20elements%20must

Example of an incorrect name:

{
 "icons size": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png"
  }
}

converts to

<root>
  <icons size>
    <16>icons/icon16.png</16>
    <32>icons/icon32.png</32>
  </icons>
</root>