Finally, we selected a subset containing 28 queries realtek alc883 hd audio codec for evaluation purposes.
For example, if the user types only the subject, then the system automatically creates variables for the property and the object.
In this interface the user creates a query by completing several (optional) fields: subject, property, object, time, location and keywords.In the case of juon the grudge game pc Google, only a result which contains relevant keywords or link in the snippet is considered relevant.However, such an approach limits the usage of the tool to users who already are familiar with sparql, thus it was omitted in the evaluation presented herein.As shown in the previous sections, SFC allows the user to create graph-based queries in a simpler way than it is done in the other graph-based querying systems.Nitelight 10 enables users to create sparql queries using a graphical notation and GUI-based editing actions.Assuming that semantic search interfaces are not much more complex than Google keywords queries, the semantic search systems may give the user more satisfying results, than Google does (see 8 and Sect.In most cases the Precision of returned answers was equal to 1 but the Recall was less than.Each query is a list of RDF-like patterns, containing resources, literals along with variable nodes.Each time a user issues a graph-based query, he/she has to specify a set of triple/fact templates that may be seen as simple senAllow keyword search Type and property recommendations Yes Yes/No Yes No Yes Yes Yes Yes No No Yes No No.SFC follows such an approach by automatically filling the variable type, based on the variable name.The user has to remember to write each triple in a new line, separate each element of the triple by a comma, and specify the type of each new variable.Yago (Yet Another Great Ontology) 12 is a knowledge base that integrates information from Wikipedia and WordNet.This feature, unique among other semantic search systems 7,8, enables to significantly reduce the amount of data pyaar tune kya kiya season 4 episode 3 that the user has to type in to construct a query.4.3, with a special attention paid to the problem of the multiplicity of the correct answers that may correspond to a given single query, and the problem of realistic estimation of the number of answers that are practically useful for a user issuing a query.PowerAqua is one of the natural language-based semantic querying systems that have been evaluated in the test.What is more, it may be difficult to construct more complex queries.If the user wants to create a query similar to the example shown in Fig.Consequently, it seems to be reasonable to assume that a regular user posses no knowledge about the sparql or about the ontology of the given knowledge base.In most cases, the answers are represented as URIs of DBpedia resources or as a string.3.2 Recommendation of variable names In SFC, the user is provided with some additional support while specifying a variable name allowing to automatically provide its type.
Acknowledgments The presented paper has been supported by European Communitys Seventh Framework Programme (FP7/20072013) under grant agreement.
On the other hand, some of the systems with natural language querying interfaces feature user-friendly interfaces, but their practical usability is usually significantly lower than that of graph-based querying systems.