0 ''
1 project_id
2 12345
3 /project_id

##</code><code>##

($xmltag, $xmlvalue) = (split /\<|\>/, $string)[1,2];

##</code><code>##

($tag,$value) = ($inline =~ /<(\/?\w+?)>([^<]*)/);

##</code><code>##

<tag>value</tag> or
<tag> or
</tag>