This namespace has no formal model definition. The URI string is used only in exercise files in Crane's hands-on training courses for placebo element types and attribute names that must be changed ("fixed") by the student in order for the exercise to run correctly.

Any element type or attribute name can be used ... there are no semantics (other than "no definition") defined for any of the labels.

A typical use of this namespace is as follows:

  xmlns:fix="fixme">

  ...

  <fix:me-1>This is another paragraph, <fix:me-2>with bold,
    <fix:me-3>bold and italic</fix:me-3>
  </fix:me-2>, and <fix:me-4>just italic</fix:me-4>.</fix:me-1>

The student is then asked to replace the "fixme" elements with appropriate elements and attributes.