A <codeSets> element contains any number of <codeSet> child elements. The schema allows multiple instances of <codeSets> containers, each with a unique name attribute."
It should say
... multiple instances of <codeSet> containers...
There is only one <codeSets> element and it does not have a name attribute.
Codesets are defined as follows:
It should say
There is only one
<codeSets>
element and it does not have a name attribute.