API:

api/classes.php
  eg: api/class.php
  result:
    <result>
      <classes>
        <class>
          ...
        </class>

        <class>
          ...
        </class>
          ...
      </classes>
    </result>


api/class.php?id=[number]
  id: unique integer corresponding to a single class, such as COMS1004

  eg: api/class.php?id=12345
  result:
    <result>
      <class>
        <id>[number]</id>
        <name>[string]</name>

        //TODO

        <books>
          <bookMaster>
            ...
          </bookMaster>

          <bookMaster>
            ...
          </bookMaster>
            ...
        </books>

      </class>
    </result>

api/bookMasters.php
  returns a list of master books.

  eg: api/bookMasters.php
  result:
    <result>
      <bookMasters>
        <bookMaster>
          ...
        </bookMaster>

        <bookMaster>
          ...
        </bookMaster>
          ...
      </bookMasters>
    </result>

api/bookMaster.php?id=[number]
  id: unique integer corresponding to a single book, such as "Big Java".
        Not dependent upon version.

  eg: api/book.php?id=12345
  result:
    <result>
      <bookMaster>
        <id>[number]</id>
        <title>[string]</title>
        <author>[string]</author>

        // TODO

        <bookVersions>
          <bookVersion>
            ...
          </bookVersion>

          <bookVersion>
            ...
          <bookVersion>
            ...
        </bookVersions>
      </bookMaster>
    </result>

api/bookVersions.php?id=[number]
  returns a list of versions for a given book

  eg: api/bookVersions.php?id=12345
  result:
    <result>
      <bookVersions>
        <bookVersion>
          ...
        </bookVersion>

        <bookVersion>
          ...
        <bookVersion>
          ...
      </bookVersions>
    </result>

api/bookVersion.php?id=[number]&version=[number]

  id: unique integer corresponding to a single book, such as "Big Java".
  version: unique integer corresponding to a specific version of a book.
              This is still dependent upon the id.

  eg: api/bookVersion.php?id=12345&version=6789
  result:
    <result>
      <bookVersions>
        <bookVersion>
          ...
        </bookVersion>

        <bookVersion>
          ...
        <bookVersion>
          ...
      </bookVersions>
    </result>

api/bookInstances.php?id=[number]
  returns a list of instances of a given book, of all versions

  eg: api/bookInstances.php?id=12345
  result:
    <result>
      <bookVersion>
        <id>[number]</int>
        <bookInstances>
          <bookInstance>
            ...
          </bookInstance>

          <bookInstance>
            ...
          <bookInstance>
            ...
        </bookInstances>
      <bookVersion>

      <bookVersion>
        <id>[number]</int>
        <bookInstances>
          <bookInstance>
            ...
          </bookInstance>

          <bookInstance>
            ...
          <bookInstance>
            ...
        </bookInstances>
      <bookVersion>

      ...

    </result>

api/bookInstances.php?id=[number]&version=[number]
  returns a list of instances of a given book, with a given version

  eg: api/bookInstances.php?id=12345&version=678
  result:
    <result>
      <bookInstances>
        <bookInstance>
          ...
        </bookInstance>

        <bookInstance>
          ...
        <bookInstance>
          ...
      </bookInstances>
    </result>

api/bookInstance.php?id=[number]&version=[number]&instance=[number]
  id: unique integer corresponding to a single book, such as "Big Java".
  version: unique integer corresponding to a specific version of a book.
  instance: unique integer corresponding to a specific instance of a
              version of a book.

  eg: api/book.php?id=12345&version=6789&instance=12345
  result:
    <result>
      <bookInstance>
        <condition>

        // TODO

      </bookInstance>
    </result>


api/query?type=[type]&query=[query]
  type: one of {author, name, ...}