Merge pull request #306 from w3c/Issue305

Fixes small bug in 18.5 Property Path Patterns

Author: hartig

spec/index.html

@@ -9812,10 +9812,11 @@ <h3>Property Path Patterns</h3>
           to other SPARQL graph patterns, such as converting property paths of length one to triple
           patterns, which in turn are combined into basic graph patterns.
           This leaves algebraic property path expressions with the operators
+          <a href="#defn_ppeAlt" class="ppeOp">alt</a>,
           <a href="#defn_ppeZeroOrOnePath" class="ppeOp">ZeroOrOnePath</a>,
           <a href="#defn_ppeZeroOrMorePath" class="ppeOp">ZeroOrMorePath</a>,
           <a href="#defn_ppeOneOrMorePath" class="ppeOp">OneOrMorePath</a>,
-          and <a href="#defn_ppeNPS" class="ppeOp">NegatedPropertySets</a>,
+          and <a href="#defn_ppeNPS" class="ppeOp">NPS</a>,
           as well as algebraic property path
           expressions contained within these operators.</p>
         <p>The property path patterns with these remaining algebraic property path expressions