PROV-AQ: Provenance Access and Query Editors: Authors: Graham - - PowerPoint PPT Presentation

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PROV-AQ: Provenance Access and Query Editors: Authors: Graham - - PowerPoint PPT Presentation

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An Overview on PROV-AQ: Provenance Access and Query Editors: Authors: Graham Klyne Luc Moreau Paul Groth Olaf Hartig Yogesh Simmhan James Myers Timothy Lebo Khalid Belhajjame Simon Miles Stian Soiland-Reyes Purpose Describes how to

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SLIDE 1

An Overview on

PROV-AQ: Provenance Access and Query

Editors: Authors: Graham Klyne Luc Moreau Paul Groth Olaf Hartig Yogesh Simmhan James Myers Timothy Lebo Khalid Belhajjame Simon Miles Stian Soiland-Reyes

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SLIDE 2

An Overview on PROV-AQ 2

Purpose

 Describes how to

 locate,  retrieve, and  query

provenance information on the Web

 Guiding principle:

 Do not reinvent the wheel  Use standard Web protocols

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SLIDE 3

An Overview on PROV-AQ 3

Main Contributions

 Simple mechanisms for discovery and retrieval  Provenance query mechanisms

 Direct HTTP query service  (SPARQL query service)

 Provenance ping-back mechanism

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SLIDE 4

An Overview on PROV-AQ 4

Outline

Key Concepts Simple Mechanisms Provenance Query Services Provenance Ping-back

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SLIDE 5

An Overview on PROV-AQ 5

Key Concepts

 Resource*  Provenance record  Provenance URI  Target URI

*Architecture of the World Wide Web, Volume One, W3C Rec.

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SLIDE 6

An Overview on PROV-AQ 6

Questions to be Addressed

 What is the provenance URI for a provenance

record about a particular resource?

 What is the relevant target URI used in some

provenance record?

 What if there is no provenance URI?  What if there is no target URI?  Out of scope:

 Representation of provenance information  Management of provenance information

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SLIDE 7

An Overview on PROV-AQ 7

Outline

Key Concepts Simple Mechanisms Provenance Query Services Provenance Ping-back

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SLIDE 8

An Overview on PROV-AQ 8

Provenance URI and Target URI ...

… for resources accessed by HTTP

 Link header field* in the HTTP response

*defined in RFC 5988

HTTP/1.1 200 OK Content-Type: text/html Date: Fri, 24 Feb 2012 12:58:02 GMT Expires: Fri, 02 Mar 2012 12:57:52 GMT Link: http://example.org/prov/aboutX; rel="http://www.w3.org/ns/prov#has_provenance"; anchor="http://example.org/X" Content-Length: 18556 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <link rel="stylesheet" type="text/css" href="main.css" /> <!-- page-specific style definitions --> <style type="text/css"> GET http://example.org/X HTTP/1.1 Accept: text/html

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SLIDE 9

An Overview on PROV-AQ 9

Provenance URI and Target URI ...

… for resources accessed by HTTP

 Link header field* in the HTTP response

*defined in RFC 5988

HTTP/1.1 200 OK Content-Type: text/html Date: Fri, 24 Feb 2012 12:58:02 GMT Expires: Fri, 02 Mar 2012 12:57:52 GMT Link: http://example.org/prov/aboutX; rel="http://www.w3.org/ns/prov#has_provenance"; anchor="http://example.org/X" Content-Length: 18556 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <link rel="stylesheet" type="text/css" href="main.css" /> <!-- page-specific style definitions --> <style type="text/css">

Link: http://example.org/prov/aboutX; rel="http://www.w3.org/ns/prov#has_provenance"; anchor="http://example.org/X"

GET http://example.org/X HTTP/1.1 Accept: text/html

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SLIDE 10

An Overview on PROV-AQ 10

Provenance URI and Target URI ...

… for resources accessed by HTTP

 Link header field* in the HTTP response

*defined in RFC 5988

HTTP/1.1 200 OK Content-Type: text/html Date: Fri, 24 Feb 2012 12:58:02 GMT Expires: Fri, 02 Mar 2012 12:57:52 GMT Link: http://example.org/prov/aboutX; rel="http://www.w3.org/ns/prov#has_provenance"; anchor="http://example.org/X" Content-Length: 18556 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <link rel="stylesheet" type="text/css" href="main.css" /> <!-- page-specific style definitions --> <style type="text/css">

Link: http://example.org/prov/aboutX; rel="http://www.w3.org/ns/prov#has_provenance"; anchor="http://example.org/X"

Target URI (optional)

GET http://example.org/X HTTP/1.1 Accept: text/html

Provenance URI

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SLIDE 11

An Overview on PROV-AQ 11

Embedding Provenance Links

 Links to provenance records may also be

embedded in representations of a resource

 Common mechanism for arbitrary

representations is out of scope

 PROV-AQ introduces mechanisms for:

 HTML  RDF

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SLIDE 12

An Overview on PROV-AQ 12

Resources Represented as HTML

 <link> elements in the <head> section

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <link rel="http://www.w3.org/ns/prov#has_provenance" href="http://example.org/prov/aboutX" /> <link rel="http://www.w3.org/ns/prov#has_anchor" href="http://example.org/X" /> <link rel="stylesheet" type="text/css" href="main.css" /> <title>Welcome</title> </head> <body> <h1>Welcome to this Web page</h1> <p>

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SLIDE 13

An Overview on PROV-AQ 13

Resources Represented as RDF

@prefix prov: <http://www.w3.org/ns/prov#> <> dcterms:title "Welcome to example.org" ; prov:has_anchor <http://example.org/X> ; prov:has_provenance <http://example.org/prov/aboutX> . : : RDF data : :

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SLIDE 14

An Overview on PROV-AQ 14

Outline

Key Concepts Simple Mechanisms Provenance Query Services Provenance Ping-back

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SLIDE 15

An Overview on PROV-AQ 15

Provenance Query Services

 Provide provenance access mechanisms:

 Simple HTTP-based query protocol for

retrieving provenance records

 SPARQL protocol for executing SPARQL

queries over provenance records

 General procedure:

  • 1. Obtain service description
  • 2. Extract information about recognized query

mechanisms and how to use them

  • 3. Select mechanism and use it as described
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SLIDE 16

An Overview on PROV-AQ 16

Obtain a Service Description

 Dereference the service-URI  Resource providers may indicate service-URIs

using the relation type denoted by: http://www.w3.org/ns/prov#has_query_service

 e.g., via a Link header field in an HTTP response:  e.g., via an RDF triple in an RDF representation:

Link: service-URI; rel="http://www.w3.org/ns/prov#has_query_service"; anchor="target-URI" <> dcterms:title "Welcome to example.org" ; prov:has_query_service <service-URI>

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SLIDE 17

An Overview on PROV-AQ 17

Service Description (in RDF)

@prefix prov: <http://www.w3.org/ns/prov#> @prefix sd: <http://www.w3.org/ns/sparql-service-description#> <service-URI> a prov:ServiceDescription ; prov:describesService <sparql-query-service> ; prov:describesService <direct-query-service> . <sparql-query-service> a sd:Service ; sd:endpoint <sparql-endpoint-URI> . <direct-query-service> a prov:DirectQueryService ; prov:provenanceUriTemplate "direct-query-template" .

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SLIDE 18

An Overview on PROV-AQ 18

Using a Direct Query Service

 For retrieving provenance about a target-URI

(that needs to be specified via a query URI)

 Possible query URIs described by URI template*

 Indicated by prov:provenanceUriTemplate  Variable uri in the template stands for the target-URI  Example template: http://example.org/pquery?target={uri}  Example invocation:

*defined in RFC 3986

GET /pquery?target=http%3A%2F%2Fexample.org/X HTTP/1.1 Host: example.org

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SLIDE 19

An Overview on PROV-AQ 19

SPARQL Query Service

 For use cases where aforementioned

mechanisms are insufficient

 Example: target-URI unknown  Example: ask for a particular piece of

provenance information only

SELECT ?provenance_uri WHERE { ?entity prism:doi "10.1007/s13222-013-0122-1" ; prov:has_provenance ?provenance_uri . } SELECT ?start_time WHERE { <http://example.org/X> prov:wasGeneratedBy ?act . ?act prov:startedAtTime ?start_time . }

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SLIDE 20

An Overview on PROV-AQ 20

Outline

Key Concepts Simple Mechanisms Provenance Query Services Provenance Ping-back

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SLIDE 21

An Overview on PROV-AQ 21

Purpose

 For discovering related provenance information

that resource publishers would not know about

 e.g., how a resource is used by third parties

 Ping-back enables cooperation among

resource publishers and using parties

 Provenance information about the use of a

resource can be posted to the publisher

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SLIDE 22

An Overview on PROV-AQ 22

Provenance Ping-Back URI

 Indicated using the relation type denoted by:

http://www.w3.org/ns/prov#pingback

 e.g., via a Link header field in an HTTP response:

 Users may post to the ping-back URI a list

  • f provenance-URIs (denoting provenance

records that describe uses of the resource)

Link: ping-back-URI; rel="http://www.w3.org/ns/prov#pingback" POST http://example.org/X/provping HTTP/1.1 Content-Type: text/uri-list http://acme.com/Y/provenance http://acme.com/another/provenance

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SLIDE 23

An Overview on PROV-AQ 23

Summary

 Simple mechanisms for discovery and retrieval  Provenance query mechanisms

 Direct HTTP query service  (SPARQL query service)

 Provenance ping-back mechanism

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SLIDE 24

An Overview on PROV-AQ 24

These slides have been created by Olaf Hartig

http://olafhartig.de

Date: May 27, 2013

This work is licensed under a Creative Commons Attribution-Share Alike 3.0 License

http://creativecommons.org/licenses/by-sa/3.0/