Thank for the quick reply!
I did have to install php7.0-xml as it was not installed.
The I added the extension setting in php.ini and checked the install.
this command: php -i | grep “xml” give me the following output
php -i | grep “xml”
/etc/php/7.0/cli/conf.d/15-xml.ini,
/etc/php/7.0/cli/conf.d/20-simplexml.ini,
/etc/php/7.0/cli/conf.d/20-xmlreader.ini,
/etc/php/7.0/cli/conf.d/20-xmlwriter.ini,
xmlrpc_error_number => 0 => 0
xmlrpc_errors => Off => Off
libxml Version => 2.9.3
libxml
Simplexml support => enabled
xml
libxml2 Version => 2.9.3
xmlreader
xmlwriter
libxslt compiled against libxml Version => 2.9.3