I can see a couple of errors in the serialization Schema:
1. "omit" is extra in the comment for yes-no-param-type
2. comment for output:encoding-param-type is wrong: "Serialization parameter element for method parameter"
I agree those are obviously typos, and I will make those corrections.
I am changing the "Importance" to "P5 - trivial" to mark this as editorial.
I have fixed these two editorial problems in the internal draft of serialization. The fix will be visible in the next public working draft.
Thank you for reporting the errors. If you agree with the corrections, may I ask you to close the bug report?