Parsing Poor XML into to PHP

Pour examples of xml, but this is what I want to do. I have a quiz. BASICALLY How do EXTRACT THE Contents and Values of these tags into strings and arrays I can work with. Depending upon the students answer, compared to the criterion below, I need to calculate a value = x/1. The score could very well be rounded down to 1/1, but at least each student will get the feedback, if a particular piece of feedback applies to the, If not, it will not appear on their evaluation sheet. I can pseudo cod ehtis in my head, but am wondering where to get started. Can someone help me take <Instructions</Instrudtions> into a string for example? Then take <Criterion[0]> through nmax = [5] into two arrays: CriterionValue and CriterionComment, as well as <feedback> 0=5 and organised the into arrays. The rest, I think I can do. John <Instructions>Take the sentence below and transform it into a Information Question.</Instructions> <Question>Harry Potter went to Hogwarts School of Wizardry.</Question> <Answer>Where did Harry Potter go? </Answer> <Criterion name=Criterion[0] value="1">Where did Harry Potter go to school?<Criterion> <Feedback>The answer was the exact answer we expected.)</Feedback> <Criterion name=Criterion[1] value=".9">Where did Harry Potter go to school ?<Criterion> <Feedback>There was a syntax error using the "?" question mark.)</Feedback> <Criterion name=Criterion[2] value=".2">Where <Criterion> <Feedback>The answer contained the correct Question word. $Criterion[2].</Feedback> <Criterion name=Criterion[3] value=".2">Where did<Criterion> <Feedback>The answer contained in $Criterion[3].</Feedback> <Criterion name=Criterion[4] value=".2">Where did Harry<Criterion> <Feedback>The answer contained in $Criterion[4].</Feedback> <Criterion name=Criterion[5] value=".2">Where did Harry go<Criterion> <Feedback>The answer contained in $Criterion[5].</Feedback> Unforgivable stuff: <Criterion name=Criterion[6] value="-.2>Hogwarts School of Wizardry<Criterion> <Feedback>No need to include the complement in a question that requires a complement.</Feedback> <Criterion name=Criterion[7] value="-.2>go at school<Criterion> <Feedback>"Go to school" not "go at school"</Feedback>