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This now prints nested form fields correctly.
* Needed a separate string format for the container field.
* Had to use `consp`, otherwise `nil` checkbox values wouldn't be
  recognised and a corresponding `<value/>` line wouldn't be printed.
* Needed to add a missing nested field to the test's expected value.
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Making progress printing nested form fields. Now we print the innermost
fields, but aren't printing the container fields.
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This isn't working yet. I'm working out how to set up the recursion to
print fields hierarchically.
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Ideas for an implementation change to allow writing XFDFs with nested
fields.
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Write `<field>` elements to the XFDF XML based on the cons cells in the
`fields` input list.
Change true and nil values to the FDF/XFDF checkbox value format of
"Yes" and "Off".
Also decided to use lowercase `t` to match the case of `nil`. Not sure
if that makes sense.
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Write a test for the `write-xfdf` function.
Worked out how to create the test system from:
- https://lispcookbook.github.io/cl-cookbook/testing.html
- https://github.com/sjl/cl-digraph/blob/master/cl-digraph.test.asd
- https://github.com/fukamachi/dexador/blob/master/dexador-test.asd
Add the test string to the `write-xfdf` function to pass the test and
check that the test runner is set up correctly.
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The library should, given a list of cons cells, generate XFDF data based
on those keys and values.
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