In the first paragraph on page 28, "contains a list of transforms" should be "contains a list of transforms, each between two coordinate frames" and "referred to as parent and child" should be "referred to as the parent and child" to improve clarity.
In the first paragraph on page 28, "contains a list of transforms" should be "contains a list of transforms, each between two coordinate frames" and "referred to as parent and child" should be "referred to as the parent and child" to improve clarity.