NAGA: Searching and Ranking Knowledge

Research Demo Publications People

Querying

A query has the form

E1 R1 E2
E3 R2 E4
...

where the Ei's are entities (e.g. Albert_Einstein) or variables (e.g. $x) and the Rj's are relations (e.g. bornOnDate) or variables (e.g. $y). The following relations are allowed:

isCalled, type, subClassOf, domain, range, subPropertyOf, familyNameOf, givenNameOf, describes, establishedOnDate, hasWonPrize, writtenInYear, locatedIn, politicianOf, sameYear, isCitizenOf, isMereonymOf, isMemberOf, isSubstanceOf, isPartOf, foundIn, discovered, discoveredOnDate, bornOnDate, bornIn, originatesFrom, diedOnDate, diedIn, isNativeNameOf, isLeaderOf, hasArea, hasPopulation, hasPopulationDensity, hasUTCOffset, hasWebsite, isNumber, hasPredecessor, hasSuccessor, isMarriedTo, isAffiliatedTo, influences, directed, produced, edited, actedIn, publishedOnDate, hasDuration, hasProductionLanguage, hasBudget, hasImdb, producedIn, hasChild, hasMotto, hasOfficialLanguage, hasCapital, hasWaterPart, hasGDPPPP, hasNominalGDP, hasHDI, hasGini, hasCurrency, inTimeZone, hasTLD, hasCallingCode, wrote, madeCoverFor, isOfGenre, published, hasPages, hasISBN, joined, livesIn, hasHeight, hasWeight, isSpokenIn, created, createdOnDate, interestedIn, hasEconomicGrowth, hasInflation, hasPoverty, hasLabor, hasUnemployment, hasExport, exports, hasImport, imports, dealsWith, hasRevenue, hasExpenses, hasMilitary, hasNumberOfPeople, usesGDP, worksAt, graduatedFrom, hasAcademicAdvisor, happenedOnDate, happenedIn, participatedIn, musicalRole, hasProduct, connect, isa, sameYear.

The R's can also be regular expressions over these relations. Both the relations and the entities can be variables (starting with $). The two relations connect and isa are pseudo-relations that only work infix in a plain line. You may also click on the results to browse through the ontological information.

Example queries

Simple queries

Planck familyNameOf $x
(try your own name...)

Albert_Einstein type subClassOf* $x

Zidane isa $x

$x wrote $y; $y type $z

$x isa scientist; $x isa politician

Max_Planck bornOnDate $x
$y bornOnDate $z
$z sameYear $x

$x isa humanist
$x discovered $y

Connect queries

Niels_Bohr connect Albert_Einstein

$x type wikicategory_Italian_physicists
$x connect Albert_Einstein
(entity names can be written in quotes (e.g. "Albert Einstein"))

for more than 2 entities you can use the following:
connect(Albert_Einstein, Niels_Bohr, Tom_Cruise)
(again entity names can be written in quotes (e.g. "Albert Einstein"))

Precautions

This interface is still experimental! It allows only a certain number of users. If you post a time-expensive query and too many users query NAGA in the meantime, your query may be canceled.
Please be aware that queries might require huge cross-product computations. If a query uses e.g. the word "Paris" and the constraint "isa physicist", then the NAGA engine has to check all 71 meanings of Paris it knows and the thousands of physicists it knows, resulting in long query times.
Try putting the most constraining lines first!
Please use lowercase for common nouns (e.g. to ask for the meanings of "bank", ask "bank means $what")

Contact

If you encounter a problem with NAGA, if you have a suggestion or a question, send a mail to Gjergji Kasneci.