Concept extraction using title and emphasized text

A system comprising:

• a document module configured to access textual data of a document, the textual data including text of the document and including a title of the document, the text of the document including emphasized text indicated within the textual data by an emphasis marker, the title being indicated within the textual data by a title marker;
• a hardware-implemented token module configured to identify a portion of the text of the document as a text token based on the portion of the text of the document appearing in the emphasized text and in the title;
• a calculation module configured to calculate a relevance value of the text token with respect to the document, the relevance value being calculated based on the textual data of the document;
• and
• a storage module configured to store the text token as concept metadata of the document, the concept metadata being indicative of a concept relevant to the document.

A machine-readable storage medium comprising instructions that, when executed by one or more processors of a machine, cause the machine to perform a method comprising:

• accessing textual data of a document, the textual data including text of the document and including a title of the document, the text of the document including emphasized text indicated within the textual data by an emphasis marker, the title being indicated within the textual data by a title marker;
• identifying a portion of the text of the document as a text token based on the portion of the text of the document appearing in the emphasized text and in the title;
• calculating a relevance value of the text token with respect to the document, the relevance value being calculated based on the textual data of the document;
• and
• storing the text token as concept metadata of the document, the concept metadata being indicative of a concept relevant to the document.