mans_bx Graham like this ?
<meta property="og:image" content="<!--parser:xtscript-->
get __xtblog_entry
if $__xtblog_entry
call source $file=/data/$__xtblog_entry
endif
<!--/parser:xtscript-->">

 Graham mans_bx No the xtscript goes in the _headtags file you have to add complete meta tags in each data files it is NOT automatic the xtscript just reads the data file and inserts the contents on the blog pages
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