$ xmllint --noout ../../../../Downloads/history.xml
../../../../Downloads/history.xml:51733: parser error : Opening and ending tag mismatch: entry line 51726 and system
</system>
         ^
../../../../Downloads/history.xml:51753: parser error : Opening and ending tag mismatch: history line 51726 and entry
</entry>
        ^
../../../../Downloads/history.xml:51754: parser error : Extra content at the end of the document
<entry>

<entry>
<system>
<item name="mt_aftrb" />
</system>
<software>
<item list="megatech" name="mt_aftrb" />
</software>
</system>
<text>Sega Mega-Tech cart. published 31 years ago: