The namespace declaration for both example outputs is incorrect.  It should be xmlns:smlerr and not xmlns:sml.  For example, the text below is incorrect:

<smlerr:errorData xmlns:sml="http://schemas.serviceml.org/smlerr/2007/02">
  <smlerr:attributeNode xmlns:u="urn:university"
                        name="u:name">MIT</smlerr:attributeNode>
  <smlerr:attributeNode xmlns:u="urn:university"
                        name="u:isPublic">false</smlerr:attributeNode>
</smlerr:errorData>

Also the following typo needs to be fixed in the first example; on the output element declaration; sml:output should be changed to smlerr:output :

<sml:output applicationUri="someApplicationUri"
                                       id="IPXML"
                                       expression=".">
                           </sml:output>