The script carries out processing an input query similar to the SELECT command of SQL on an input file/stdin formatted in XML. The output is an XML file or XML outputted to stdout.
Usage:
-n Do not generate the XML header on the output of the script.
--help Print the help statement.
--input= Set the input file in XML format.
--output= Set the output file in XML format.
--query=<query> Set a query in the language defined by the assignment.
--qf= Set a query located in a file in the language defined by the assignment.
--root= The name of the pair root element encapsulating the results.
php xqr.php --input=input.xml --query="SELECT book FROM library" --output=test.out --root=Wrapper