<command/> Tag Syntax
Rules for coding HTML command/ elements
<command .../><command/> Content Model
Contents of the command element
Content: Empty. All properties are coded using attributes.
Since the <command/> tag is a void element, it is not allowed to have any content, even HTML comments and therefore should always be coded as a self-closing standalone tag, ending with the delimiters /> rather than just > (<command .../>).