anchor.diff:  
   At last, we evaluate Usefulness Score as follows:
   
  -latexmath:[$\begin{array}{lll}
  +latexmath:[\begin{array}{lll}
     {\rm Usefulness} & = & 30.0 * {\rm Metadata~Score} \\
                      & + & 40.0 * f10({\rm Vocabulary~Score}) \\
                      & + & 30.0 * {\rm Ontology~Score}
  -  \end{array}$]
  +  \end{array}]
   
   where
   
  -latexmath:[$f10(x) = \left\{
  +latexmath:[f10(x) = \left\{
       \begin{array}{ll}
         10 & {\rm if}~x>10 \\
         x  & {\rm Otherwise}
       \end{array}
  -  \right.$]
  +  \right.]
   
   [[validity]]
   === 2.5 Validity
  
positive.code: 
  After that, we evaluate Performance as:
  
  Performance = latexmath:[$\left\{
      \begin{array}{ll}
          \multicolumn{2}{l}{100.0 * (1.0 - {\rm Execution~Time})} \\
            & {\rm if~Execution~Time~is~less~than~1~second}  \\
          0 & {\rm Otherwise}
      \end{array}
      \right.$]
  
negative.code: Ontology Score is calculated as follows:
  +
  Vocabulary Score =
  latexmath:[\frac{\displaystyle \sum_{graphs}^{g}o(g)}{N}]
  
  where
  
  latexmath:[N] = Number of Graphs
  
  latexmath:[o(g)] = latexmath:[\frac{NCO}{NO}]
  
  latexmath:[NO] = Number of Ontologies used for Properties
  
  latexmath:[NCO] = Number of Ontologies used for Properties in Table
  \[table:list_of_common_ontologies\]
  +
  .List of Common Ontologies
  