I have a xml file,recipe.xml which i need to parse and i am using "LIBXML" parser. 
<?xml version="1.0" encoding="ISO-8859-1" ?> 
- <recipe name= "Chocolate Chip Bars"> 
  <optional>vanilla,mango,nuts</optional> 
  <step name="Preheat oven to 350 degrees"/>
  <step name="Melt butter" />
  <step name="combine with brown sugar and vanilla in large mixing bow
+l">
  <dependency use="vanilla"/>
   </step>
   <step name="combine with brown sugar and vanilla,nuts in large mixi
+ng bowl">
  <dependency use="vanilla,nuts,!mango"/>
   </step>
   <step name="combine with brown sugar and mango in large mixing bowl
+">
   <dependency use="mango,!vanilla,!nuts"/>
   </step>
   ...
   </recipe>
   <recipe name="chocolate cake">
   ....

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This is the xml which i have taken and it is just an example and it is simliar to the one which i am using.i have an executable by name 'recipe'. so if i run 'recipe -name Chocolate Chip Bars" it will select the recipe name "Chocolate Chip Bars" and its contents. or if i specify 'recipe -name chocolate cake' it will select the recipe name "chocolate cake " and its contents. To select the proper contents, In the command line, i will specify 'recipe -name Chocolate Chip Bars -use "vanilla"',then it should select 'step name=combine with brown sugar and vanilla in large mixing bowl' and if i specify 'recipe -name Chocolate Chip Bars -use "vanilla,nuts",then it should select 'step name=combine with brown sugar and vanilla,nuts in large mixing bowl '.this is where i am facing the problem.what is the best way to select the "dependency" depending on the specification from the command line. my code: 
   my $parser = XML::LibXML->new();
   my $recipeDoc = $parser->parse_file("recipe.xml");
   foreach my $recipe ($recipeDoc->getElementsByTagName("recipe")) {
    $recipeName = $recipe->getAttribute("name");
    foreach my $step ($recipe->getElementsByTagName("step")) {
     foreach my $dep ($step->getElementsByTagName("dependency")) {
     if($dep->hasAttribute("use") {
      # this is where i am struck.
      # here i have to get value from the command line ( and i know ho
+w to get the information from command line) and match it with the dep
+endency value. (the issue is with matching it with the dependency val
+ue after getting the values from command line)
      }
      $stepName = $step->getAttribute("name");
     }
   }

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In reply to parsing xml file using LIBXML by Madam

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