Canonical Form

<?xml version="1.0"?>

<!DOCTYPE cost SYSTEM "BookCatalogue.dtd">

<cost units="USD"ᡟ.99</cost>

Canonicalization algorithm:

- Add default values to attributes.

<?xml version="1.0"?>

<!DOCTYPE cost SYSTEM "BookCatalogue.dtd">

<cost units="USD"ᡟ.99</cost>

<?xml version="1.0"?>

<!DOCTYPE cost SYSTEM "BookCatalogue.dtd">

<costᡟ.99</cost>

canonicalize

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