| http://www.w3.org/ns/prov#value | - when you need printing more than one strings where there may be variables or other things between them, it would be annoying to write a new statement to echo all the parts. php has a nice way of doing this for you, string concatenatinglet me show you an example:echo you have . $msg_num . messages! ;the . operator is the string concatenation operator and is very useful for situations like this
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