Installing
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2. Installing EPEL RepoHow to Enable EPEL Repository for CentOS GNU/Linux 
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3. Installing 7-ZipThen to Set up 7-Zip on CentOS 8 
 Simply Executing:sudo dnf install p7zip p7zip-plugins 
Contents
$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }
How to Enable EPEL Repository for CentOS GNU/Linux
Then to Set up 7-Zip on CentOS 8
Simply Executing:
sudo dnf install p7zip p7zip-plugins