Document retrieval through assertion analysis on entities and document fragments

A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions readable by a device to cause the device to:

• receive a document;
• extract logical structures and entities from the document by parsing the document, the logical structures including sectional fragments of the document representative of the document's organization;
• for an entity in the extracted entities,
• create an object representing the entity, the creating the object comprising allocating a memory to store the object representing the entity;
• determine an assertion made in the document associated with the entity;
• link the assertion to the object representing the entity;
• identify a logical structure from the extracted logical structures and a content of the logical structure containing the assertion;
• label the logical structure with a name that identifies where in the document the assertion appears;
• and
• link the logical structure and the content of the logical structure to the object representing the entity,
• wherein a database of structured knowledge is built that links the entities to corresponding assertions and corresponding logical structures in which the entities occur,
• wherein the logical structure is linked to the object representing the document with an attribute representing an organizational relationship of the logical structure to the document, wherein a structured form of the document is created.

A system comprising:

• a hardware processor coupled with a memory device, the hardware processor configured to:
• receive a document;
• extract logical structures and entities from the document by parsing the document, the logical structures including sectional fragments of the document representative of the document's organization;
• for an entity in the extracted entities,
• create an object representing the entity, the creating the object comprising allocating a memory to store the object representing the entity;
• determine an assertion made in the document associated with the entity;
• link the assertion to the object representing the entity;
• identify a logical structure from the extracted logical structures and a content of the logical structure containing the assertion;
• label the logical structure with a name that identifies where in the document the assertion appears;
• and
• link the logical structure and the content of the logical structure to the object representing the entity,
• wherein a database of structured knowledge is built that links the entities to corresponding assertions and corresponding logical structures in which the entities occur,
• wherein the logical structure is linked to the object representing the document with an attribute representing an organizational relationship of the logical structure to the document, wherein a structured form of the document is created.