Submit the DATALINES statement to create a temporary file. Later in the example, the temporary input XML file is called by the procedure's IN= argument.

data _null_;
   file myinput;
   input;
   put _infile_ ' ';
   datalines;
<GetMetadataObjects>
   <Reposid>$METAREPOSITORY</Reposid>
   <Type>Column</Type>
   <Objects/>
   <Ns>SAS</Ns>
   <Flags>1</Flags>
   <Options/>
</GetMetadataObjects>
;;
run;
proc metadata
     in=myinput
     out=myoutput;
run;