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Simple SPARQL Tutorial 27/29: Understanding Named Graphs
Simple SPARQL Tutorial 27/29: Understanding Named Graphs
Published: 2014/03/03
Channel: Noureddin Sadawi
Simple SPARQL Tutorial 28/29: Querying Named Graphs - using NAMED GRAPH and GRAPH
Simple SPARQL Tutorial 28/29: Querying Named Graphs - using NAMED GRAPH and GRAPH
Published: 2014/03/03
Channel: Noureddin Sadawi
Simple SPARQL Tutorial 29/29: More on Querying Named Graphs - Multiple NAMED GRAPHs
Simple SPARQL Tutorial 29/29: More on Querying Named Graphs - Multiple NAMED GRAPHs
Published: 2014/03/03
Channel: Noureddin Sadawi
2015.03.25. Apache Jena Fuseki 2.0.0 - Named Graph
2015.03.25. Apache Jena Fuseki 2.0.0 - Named Graph
Published: 2015/03/25
Channel: Viet Hoang Le
2015.03.25. Apache Jena Fuseki 2.0.0 - Named Graph example
2015.03.25. Apache Jena Fuseki 2.0.0 - Named Graph example
Published: 2015/03/25
Channel: Viet Hoang Le
How to download install and use graph
How to download install and use graph
Published: 2008/11/29
Channel: TI84tutorialz
What is a Pupper? What is a Doggo?
What is a Pupper? What is a Doggo?
Published: 2017/05/22
Channel: Lucidchart
Gallery of named graphs
Gallery of named graphs
Published: 2016/01/22
Channel: WikiAudio
Using Graph Keys to Make the Science Section Easy
Using Graph Keys to Make the Science Section Easy
Published: 2016/04/13
Channel: Veritas Prep College
Random & Distributed Graphs
Random & Distributed Graphs
Published: 2015/04/26
Channel: Complexity Labs
How to Graph/Chart Hidden Data in Excel
How to Graph/Chart Hidden Data in Excel
Published: 2008/08/24
Channel: TeachExcel
excel 2010 named ranges and graph
excel 2010 named ranges and graph
Published: 2013/03/15
Channel: R.N.A. Creation
Neural networks [3.9] : Conditional random fields - factor graph
Neural networks [3.9] : Conditional random fields - factor graph
Published: 2013/11/16
Channel: Hugo Larochelle
What Is A Graph In Graph Theory?
What Is A Graph In Graph Theory?
Published: 2017/08/17
Channel: Oakley Oakley
How to  Search to target your audience and building your first list from scratch.
How to Search to target your audience and building your first list from scratch.
Published: 2015/12/23
Channel: Hede Sales
Introduction to Pivot Tables, Charts, and Dashboards in Excel (Part 1)
Introduction to Pivot Tables, Charts, and Dashboards in Excel (Part 1)
Published: 2015/02/04
Channel: Excel Campus - Jon
What Is The Definition Of A Line Graph?
What Is The Definition Of A Line Graph?
Published: 2017/11/10
Channel: Nuefrt Neli
How to draw a flower in Graph
How to draw a flower in Graph
Published: 2008/11/29
Channel: TI84tutorialz
Motion Graphics - Graph 5 ~ Named Wish
Motion Graphics - Graph 5 ~ Named Wish
Published: 2014/02/07
Channel: Fadhil Primadi
Math- make a curved line in a graph using Excel --option with talking software
Math- make a curved line in a graph using Excel --option with talking software
Published: 2015/04/28
Channel: Dr Denise M Robinson
Google Denies Algorithm Update, Facebook Graph Search Launches & The Zamboni Google Logo
Google Denies Algorithm Update, Facebook Graph Search Launches & The Zamboni Google Logo
Published: 2013/01/18
Channel: rustybrick
fuck graph
fuck graph
Published: 2009/09/22
Channel: bunnysaswine
Excel Creating Graphs – Easily Add Data to Charts, Change Graph Elements & Excel Graph Customization
Excel Creating Graphs – Easily Add Data to Charts, Change Graph Elements & Excel Graph Customization
Published: 2017/02/19
Channel: Tutorials with GS
BMW Corporate Report Makeover in Excel: Graph Versus Table (Part 1)
BMW Corporate Report Makeover in Excel: Graph Versus Table (Part 1)
Published: 2017/10/12
Channel: Leila Gharani
What Is The Definition Of A Line Graph?
What Is The Definition Of A Line Graph?
Published: 2017/11/14
Channel: Xerioc Xuj
Excel Dynamic Chart with Drop down List (column graph with average line)
Excel Dynamic Chart with Drop down List (column graph with average line)
Published: 2017/12/07
Channel: Leila Gharani
What is RESOURCE DESCRIPTION FRAMEWORK? What does RESOURCE DESCRIPTION FRAMEWORK mean?
What is RESOURCE DESCRIPTION FRAMEWORK? What does RESOURCE DESCRIPTION FRAMEWORK mean?
Published: 2017/03/18
Channel: The Audiopedia
What Is A Line Graph?
What Is A Line Graph?
Published: 2017/11/09
Channel: Guinow Gwev
Flexibility of the Hamming graph(3,3)
Flexibility of the Hamming graph(3,3)
Published: 2017/06/05
Channel: Mike Winkler
Market Today Software:. Graph:. DSE Listed Companies Graph
Market Today Software:. Graph:. DSE Listed Companies Graph
Published: 2013/10/20
Channel: Market Today
3ds Max - MCG - An introduction to Max Creation Graph
3ds Max - MCG - An introduction to Max Creation Graph
Published: 2015/04/17
Channel: Autodesk 3ds Max Learning Channel
Graph Objects Network Analysis using NetworkX and Graph Generator in Python - Tutorial 27
Graph Objects Network Analysis using NetworkX and Graph Generator in Python - Tutorial 27
Published: 2017/09/13
Channel: TheEngineeringWorld
What Is The Definition Of A Line Graph?
What Is The Definition Of A Line Graph?
Published: 2017/07/26
Channel: sri sparky
What Is A Line Graph?
What Is A Line Graph?
Published: 2017/07/26
Channel: sri sparky
The Adventures of Azure Functions and Microsoft Graph
The Adventures of Azure Functions and Microsoft Graph
Published: 2018/01/12
Channel: PixelMill
TUTORIAL -  How to use alcohol markers (Graph
TUTORIAL - How to use alcohol markers (Graph'it, Copic, tria etc.)
Published: 2015/04/26
Channel: Sakuems
How to Create a Five Thirty Eight Graph in Excel
How to Create a Five Thirty Eight Graph in Excel
Published: 2015/07/12
Channel: Sean John Thompson
How to remove blank/ zero values from a graph in excel?
How to remove blank/ zero values from a graph in excel?
Published: 2017/03/08
Channel: Karina Adcock
KUMONOTE - a network/graph analysis software
KUMONOTE - a network/graph analysis software
Published: 2008/12/23
Channel: tkykhs
Little Fairy - Graph
Little Fairy - Graph'it Markers - Standard nib Drawing time lapse
Published: 2015/05/09
Channel: Sakuems
How to Use Graph Search on Facebook
How to Use Graph Search on Facebook
Published: 2014/03/15
Channel: jobs4mind.com - Work at Home Job Portal
Excel Arduino Real Time Plot Graph
Excel Arduino Real Time Plot Graph
Published: 2015/12/11
Channel: hafizuddin mohd lowhim
PoolParty Visual Mapper - RDF Visualization of Knowledge Graphs!
PoolParty Visual Mapper - RDF Visualization of Knowledge Graphs!
Published: 2015/11/30
Channel: PoolParty Semantic Suite
RDF4U: RDF Graph Visualization
RDF4U: RDF Graph Visualization
Published: 2015/10/21
Channel: Rathachai Chawuthai
Excel Tutorial - Dividing graph data into two sections & Extrapolating Trendline.mov
Excel Tutorial - Dividing graph data into two sections & Extrapolating Trendline.mov
Published: 2013/02/26
Channel: ispazzyi
Distributed Graph-based Entity Resolution Using Spark- Mahdi Namazifar (Cisco)
Distributed Graph-based Entity Resolution Using Spark- Mahdi Namazifar (Cisco)
Published: 2015/04/10
Channel: Spark Summit
Sedrick - Nano Beacon Graph
Sedrick - Nano Beacon Graph
Published: 2016/08/10
Channel: The Real Sedrick
How to make a graph and Job Plot in excel
How to make a graph and Job Plot in excel
Published: 2013/10/02
Channel: mrsjulianchem
TUTORIEL - Feutres à alcool (type graph
TUTORIEL - Feutres à alcool (type graph'it, copic) - PARTIE 2
Published: 2015/04/26
Channel: Sakuems
HOW TO CREATE DYNAMIC GRAPH IN EXCEL
HOW TO CREATE DYNAMIC GRAPH IN EXCEL
Published: 2017/03/24
Channel: PK: An Excel Expert
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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A named graph

Named graphs are a key concept of Semantic Web architecture in which a set of Resource Description Framework statements (a graph) are identified using a URI,[1] allowing descriptions to be made of that set of statements such as context, provenance information or other such metadata.

Named graphs are a simple extension of the RDF data model[2] through which graphs can be created but the model lacks an effective means of distinguishing between them once published on the Web at large.

Named graphs and HTTP[edit]

One conceptualization of the Web is as a graph of document nodes identified with URIs and connected by hyperlink arcs which are expressed within the HTML documents. By doing a HTTP GET on a URI (usually via a Web browser), a somehow-related document may be retrieved. This "follow your nose" approach also applies to RDF documents on the Web in the form of Linked Data, where typically an RDF syntax is used to express data as a series of statements, and URIs within the RDF point to other resources. This Web of data has been described by Tim Berners-Lee as the "Giant Global Graph".[3]

Describing a named graph

Named graphs are a formalization of the intuitive idea that the contents of an RDF document (a graph) on the Web can be considered to be named by the URI of the document. This considerably simplifies techniques for managing chains of provenance for pieces of data and enabling fine-grained access control to the source data. Additionally trust can be managed through the publisher applying a digital signature to the data in the named graph. (Support for these facilities was originally intended to come from RDF reification, however that approach proved problematic.[4])

Named graphs and RDF stores[edit]

While named graphs may appear on the Web as simple linked documents (i.e. Linked Data), they are also very useful for managing sets of RDF data within an RDF store. In particular, the scope of a SPARQL query may be limited to a specific set of named graphs.

Example[edit]

Assume the following (Turtle) RDF document has been placed in a SPARQL-capable store with the name http://example.org/joe.

@prefix foaf: <http://xmlns.com/foaf/0.1/> .

<http://example.org/joe#me> a foaf:Person .
<http://example.org/joe#me> foaf:homepage <http://example.org/joe/index.html> .
<http://example.org/joe#me> foaf:mbox <mailto:joe@example.org> .
<http://example.org/joe#me> foaf:name "Joe Lambda" .

This data has been written in a more verbose form than necessary to show the triple structures

The homepage of the person with the email address mailto:joe@example.org can be obtained using the SPARQL query:

PREFIX foaf: <http://xmlns.com/foaf/0.1/>

SELECT ?homepage

FROM NAMED <http://example.org/joe>

WHERE {
	GRAPH ?g {
		?person foaf:homepage ?homepage .
		?person foaf:mbox <mailto:joe@example.org> .
	}
}

The FROM NAMED here identifies the target graph for the query.

Named graphs and quads[edit]

Prior to the publication of the papers describing named graphs, there was considerable discussion about fulfilling their role within a store by using an arity above that of RDF triple statements: where triples have the form <subject> <predicate> <object>, quads would have a form along the lines of <subject> <predicate> <object> <context>. Named graphs can be represented this way, as <subject> <predicate> <object> <graphname>, with the advantage that the <graphname> part will be a URI, giving the quad Web-global scope compared to arbitrary local statement names. This way of representing quads resp. quad-statements was incorporated in the specification of N-Quads.[5]

Formal definition[edit]

A paper from the WWW 2005 conference by Carroll et al. includes a formal definition of named graphs.[6]

Specifications[edit]

There is currently no specification for named graphs in themselves beyond that described in Carroll et al. (2005)[6] and Carroll and Stickler (2004)[7] (which includes syntaxes for representing named graphs), but they do form part of the SPARQL Protocol and RDF Query Language specification.

Proposed specifications[edit]

See also[edit]

References[edit]

  1. ^ strictly speaking a URIRef
  2. ^ http://www.w3.org/TR/PR-rdf-syntax/ "Resource Description Framework (RDF) Model and Syntax Specification"
  3. ^ Giant Global Graph
  4. ^ Reification of RDF and N3
  5. ^ https://www.w3.org/TR/n-quads/
  6. ^ a b [1]
  7. ^ TriX : RDF Triples in XML

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