First bullet just below the table in section 6.4 reads:
"If the pattern has the form of a DocumentTest, then if it includes no 
ElementTest the priority is −0.5. If if does include an ElementTest, then the 
priority is the same as the priority of that ElementTestXP, computed according 
to the table above."

1.  typo - "If if"
2.  this bullet should mention SchemaElementTest as well.

"If the pattern has the form of a DocumentTest, then if it includes no 
ElementTest and no SchemaElementTest the priority is −0.5. If it does include 
an ElementTest or a SchemaElementTest, then the priority is the same as the 
priority of that ElementTest or SchemaElementTest, computed according to the 
table above."