- Result items should be relevant to the information need expressed by the concepts contained in the query statements, even if the terminology used by the result items is different from the terminology used in the query.
- Result items should be sorted and ranked by relevance.
- Relevant result items should be quickly located and displayed. Even complex queries should return relevant results fairly quickly.
- Query length should be non-fixed, i.e., a query can be as long as deemed necessary. A sentence, a paragraph, or even an entire document can be submitted as a query.
- A concept query should not require any special or complex syntax. The concepts contained in the query can be clearly and prominently expressed without using any special rules.
- Combined queries using concepts, keywords, and metadata should be allowed.
- Relevant portions of result items should be usable as query text simply by selecting the item and telling the search engine to find similar items.
- Query-ready indexes should be created relatively quickly.
- The search engine should be capable of performing Federated searches. Federated searching enables concept queries to be used for simultaneously searching multiple datasources for information, which are then merged, sorted, and displayed in the results.
- A concept search should not be affected by misspelled words, typographical errors, or OCR scanning errors in either the query text or in the text of the dataset being searched.
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