Are these nested comments allowed in a XML file?
<!-- Making only one observation attempting to correct the error code -->
<!-- <component>
<!-- Result observation template -->
<!-- <id root="2.16.840.1.113883.19.5.10" extension="103220"/>
</component> -->
Notepad++ together with the plugin XML Tools can do this.
Select a block of xml and on the xml tools submenu selected "Comment Selection".
Each existing "inner xml comment" will be altered so that it looks like this
<!{1}** inner xml comment **{1}>
and if you add another outer comment in this way, those original inner comments will be further altered to
<!{2}** inner xml comment **{2}>
Without a workaround described below, it's not allowed because -- can't appear in a comment.
Potential solutions: