SPARQL Query Language Learning Abstract

SPARQL query language for RDF

Contents

* 1. Invalid duction
* 2. Making simple queries
* 3. RDF term constraints
* 4. SPARQL syntax (syntax)
O 4.1 IRIS (URIs)
O 4.2 syntax for literals
O 4.3 query the syntax of a Variable
O 4.4 blank node syntax
O 4.5 triples model syntax
O 4.6-Object List
O 4.7 Object List
O 4.8 compound list
O 4.9 RDF set
O 4.10 when the RDF: type is a predicate, it can be replaced by.
* 5. Graph patterns (Mode)
O 5.1 group graph patterns
O 5.2 empty group Pattern
O 5.3 scope of filters filtering range
* 6. including optional values (optional)
* 7. match one of the two matching alternatives
* 8. RDF dataset data set
* 9. Sort results and modify solution sequences and modifiers
O repeated results duplicate soulution
* 10. query forms
* 11. Test Value: testing values
O operand data type openrand Data Types
O filter rating filter Evaluation
* 12. SPARQL defines definition of SPARQL
O rdf terms (TERM)

1. Billing duction

* Turtle data format (tutle Data Format)

2. Making simple queries

Simple query:

Select? Title
Where
{
<Http://example.org/book/book1> }

Building RDF graphs, replace select with construct:

Construct {? X foaf: Name? Name}
Where {? X org: employeename? Name}

3. RDF term constraints

Regular Expression Filter filter RegEx ():

Prefix DC: Select? Title
Where {? X dc: title? Title
Filter RegEx (? Title, "Web", "I ")
}

4. SPARQL syntax (syntax)
4.1 IRIS (URIs)

Different representations of the same Siri:

<Http://example.org/book/book1>

Base <Book1>

Prefix book: Book: book1

4.2 syntax for literals
4.3 query the syntax of a Variable

'? ',' $ 'Are equivalent

4.4 blank node syntax

[: P "v"].
[]: P "V ".
_: B57: P "v". // The _: Label added in front
[: P "v"]: Q "W". // blank node combination

Simple blank node:

[Foaf: Name? Name;
Foaf: mbox <mailto: alice@example.org>]

4.5 triples model syntax

Prefix DC: Prefix:

Select $ title
Where {: book1 DC: Title $ title}

4.6 Object List

? X foaf: Name? Name;
Foaf: mbox? Mbox.

4.7 Object List

? X foaf: Nick "Alice", "Alice _".

4.8 compound list

? X foaf: Name? Name; foaf: Nick "Alice", "Alice _".

It is equivalent:

? X foaf: Name? Name.
? X foaf: Nick "Alice ".
? X foaf: Nick "Alice _".

4.9 RDF set

(1? X 3 4): p "W ".

4.10 when the RDF: type is a predicate, it can be replaced by.

? X a: class1.

5. Graph patterns (Mode)
5.1 group graph patterns

Prefix foaf: Select? Name? Mbox
Where {
? X foaf: Name? Name.
? X foaf: mbox? Mbox.
}

5.2 empty group Pattern

{}
Select? X where {}

5.3 scope of filters filtering range

Filter RegEx (? Name, "Smith ")

6. including optional values (optional)

Optional pattern matching

Where {? X foaf: Name? Name.
Optional {? X foaf: mbox? Mbox}
}

Constraints in optional pattern matching

Select? Title? Price
Where {? X dc: title? Title.
Optional {? X ns: Price? Price. Filter (? Price <30 )}
}

Multiple optional graph patterns

Select? Name? Mbox? Hpage
Where {? X foaf: Name? Name.
Optional {? X foaf: mbox? Mbox }.
Optional {? X foaf: homepage? Hpage}
}

7. match one of the two matching alternatives

Union:

Select? X? Y
Where {{? Book dc10: title? X} Union {? Book dc11: title? Y }}

8. RDF dataset data set

Query Information in Multiple Graphs
9. Sort results and modify solution sequences and modifiers

Sort order:

Select? Name
Where {? X foaf: Name? Name}
Order? Name

Ing projection
Duplicate result duplicate soulution

Unique distinct:

Prefix foaf: Select distinct? Name where {? X foaf: Name? Name}

Simplified forced CED:

Prefix foaf: Select reduced? Name where {? X foaf: Name? Name}

Offset offset, limit:

Select? Name
Where {? X foaf: Name? Name}
Order? Name
Limit 5
Offset 10

10. query forms

*

Select

Returns all, or a subset of, the variables bound in a query pattern match.

*

Construct

Returns an RDF graph constructed by substituting variables in a set of triple templates.

*

Ask

Returns a Boolean indicating whether a query pattern matches or not.

*

Describe

Returns an RDF graph that describes the resources found.

11. Test Value: testing values
Operand data type openrand Data Types

* XSD: integer
* XSD: decimal
* XSD: Float
* XSD: double
* XSD: String
* XSD: Boolean
* XSD: datetime

Filter evaluation filter Evaluation
A B a | B a & B
T
T f
F t f
F
T e
E t e
F E F
E F
E
12. SPARQL definition Definition of SPARQL
RDF terms (TERM)

RDF term:

RDF
Let I be the set of all Iris. Let RDF-L be the set of all RDF literals let RDF-B be the set of all blank nodes in RDF Graphs

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