Table 1 An example of inverted index

File ID

id(F_{i 1})

id(F_{i 2})

id(F_{i 3})

…

$\mathit{id}\left({\mathit{F}}_{\mathit{i}{\mathit{n}}_{\mathit{i}}}\right)$

Relevance score

S _{i 1}

S _{i 2}

S _{i 3}

…

${\mathit{S}}_{\mathit{i}{\mathit{n}}_{\mathit{i}}}$