In summary

Customer feedback comes in the form of comments. Comments have two kinds of sentences: statements of sentiment and declarative statements.

Occasionally a connector is used to join two or more sentences together. It is possible for there to be statements of sentiment with different values, one positive and one negative. Some statements of sentiment are inherently negative. Both negations and the inherent attitude of the statement must be considered in order to determine the meaning of the sentence.

It is useful to organize the statements of sentiment according to supercategories. Typical supercategories include person, place, product, process, price, promotion, and company.

Most but not all sentences can be interpreted properly by textual ETL.