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##Procedures
##procedure concatenate
##You can define procedures the same way as in other Msc-generator languages with input parameters (and optional defaults). Use the '~' symbol to concatenate text and variable content and the '\Q()' text escape to insert the value of a variable into a label.
defproc addgroup($group_name, $target, $color=black) {
edge [color=$color];
A_~$group_name->$target:: \c($color) 1st\n(\Q($group_name));
B_~$group_name->$target:: \c($color) 2nd\n(\Q($group_name));
C_~$group_name->$target:: \c($color) 3rd\n(\Q($group_name));
}
graph {
composite;
replay addgroup(iron, composite);
replay addgroup(steel, composite, blue);
replay addgroup(gold, composite, yellow);
};
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