XDOC examples

Here are some examples of 6.002x problems that written using XDOC. They show what kinds of things need to be implemented.

Remember to check that your browser handles MathML before trying these.

• circuit1.xdoc is a simple fill-in-the-blanks question.

• christmas-lights.xdoc has both fill-in and multiple choice

• system-functions.xdoc shows use of MathML. Also has matching problems, which needs a scoring procedure that requires all matches to be correct in order to indicate a correct response.

• ce-analysis.xdoc First part of amplifier design problem set, before we move to the actual design part, with the intelligent book.

• weighted-sums.xdoc Demonstrates the need for a verification procedure that looks at all of the values together.

• These pages don't seem to work with IE, which barfs at the xdoc document type. Is there a mime-type missing here, or something? Oris this real Redmond brain death?

• The current tag writes the expected answer as an xml comment, so anyone looking at the page source can see the expected answer.

• The answer tags aren't doing the right thing, either in formatting or in checking. These need to be redesigned. Chris and I should talk about this.

• Here is a link that should work, but doesn't always: pset-examples/circuit1.xdoc. The problem happens when you are reaching the current page using the url
  http://www.swiss.ai.mit.edu/projects/scheme-pages/hal/for-6002x
  without a trailing slash. In this case, the generated link is missing the for-6002x part of the name. Is this a problem with scheme-pages?

• We need a more flexible way to specify tolerances on numeric answers. For example, we should be able to specify relative tolerances.

• Need a make-random-state procedure that uses the user-id as the seed, so logging in twice gives the same random values.