1.MetaQL Overview #

1.1.Overview #

  • Overview goes here

2.Select Queries #

Example:

SELECT {
value limit: 100
        value offset: 0
        value segments: ["mydata"]
constraint { Person.class }
constraint { Person.props().name.equalTo("John" ) }
}

The results are returned in a ResultList containing GraphObjects.

3.Graph Queries #

Example:

Given a set of Email messages with links to senders and receivers, find all messages sent by “john@example.org“, excluding those he sent to himself.

GRAPH {
    value segments: ["mydata"]
ARC {
          node_constraint { Email.class }
          constraint { "?person1 != ?person2" }
          ARC_AND {
              ARC {
                edge_constraint { Edge_hasSender.class }
                node_constraint {Person.props().emailAddress.equalTo("john@example.org")
                node_constraint { Person.class }
                node_provides { "person1 = URI" }
             }
              ARC {
                edge_constraint { Edge_hasRecipient.class }
                node_constraint { Person.class }
                node_provides { "person2 = URI" }
             }
          }
        }
    }

The results are returned in a ResultList containing GraphMatch objects, each of which contains a set of URIs of the matching graph elements.

For the above example, each result includes:

  • URI of an email message

  • URI of the edge connecting the email to a sender

  • URI of the sender, which would the the URI of the Person with email addresss “john@example.org

  • URI of the edge connecting the email to a recipient

  • URI of the recipient Person, which is enforced to be not the same as the sender

4.Path Queries #

5.Aggregation Queries #

DISTINCT, COUNT, SUM, AVERAGE, FIRST, LAST, COUNT+DISTINCT, FIRST+DISTINCT, LAST+DISTINCT

6.Domain Ontology Integration #

7.Vital AI Implementation #

8.Vital Service Lucene Implementation #

9.Vital Service Sparql Implementation #

10.Vital Service DynamoDB Implementation #

11.Vital Service MongoDB Implementation #

12.Vital Service IndexDB Implementation (Combine Indexing Service with Database Service) #

13.Vital Service Vital Prime Implementation #

14.Vital Service Spark Implementation #

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