anchor.diff:  Vocabulary Score is calculated as follows:
   +
   Vocabulary Score =
  -latexmath:[$\frac{\displaystyle \sum_{graphs}^{g}v(g)}{N}$]
  -+
  +latexmath:[\frac{\displaystyle \sum_{graphs}^{g}v(g)}{N}]
  +
   where
  -+
  -latexmath:[$N$] = Number of Graphs
  -+
  -latexmath:[$v(g)$] = Number of Properties in Graph g
  +
  +latexmath:[N] = Number of Graphs
  +
  +latexmath:[v(g)] = Number of Properties in Graph g
   * Ontology Score
   +
   Ontology Score, which is calculated based on metadata, represents how
  
positive.code: 
  We calculate Operation score as follows:
  
  Operation = latexmath:[$\left\{
      \begin{array}{ll}
        0   & {\rm if~both~of~them~are~false } \\
        50  & {\rm if~one~of~them~is~false } \\
        100 & {\rm if~both~of~them~are~true }
    \end{array}
    \right.$]
  
  [[usefulness]]
  === 2.4 Usefulness
  
negative.code: 
  At last, we evaluate Usefulness Score as follows:
  
  latexmath:[\begin{array}{lll}
    {\rm Usefulness} & = & 30.0 * {\rm Metadata~Score} \\
                     & + & 40.0 * f10({\rm Vocabulary~Score}) \\
                     & + & 30.0 * {\rm Ontology~Score}
    \end{array}]
  
  where
  
  latexmath:[f10(x) = \left\{
      \begin{array}{ll}
        10 & {\rm if}~x>10 \\
        x  & {\rm Otherwise}
      \end{array}
    \right.]
  
  [[validity]]
  === 2.5 Validity
  