Yads

YADS – A Description

Service

Tony HammondNature Publishing Group

“Down in Hollywood”

“Going down in HollywoodYou better hope that you don't run out of gas

Down in HollywoodHe'll drag you right out of your car and kick your ass

Down in HollywoodThey're standing on a corner waiting for a sucker like you

Down in HollywoodNow, if you want to stay healthy just keep

a-moving right on through”

– Ry Cooder, Bop Till You Drop

YADS – “Down in Hollywood”

YADS – Balance Sheet

Caveats

Like Lazarus – Newly Arisen Legacy DOI Roots Work in Progress Open Issues

Features

Body of Work Available RDF & XML Views Cooked into CrossRef schema

YADS– A Description Service (1)

Open Data Model for Digital Objects Manages Resource Hierarchies Simple Generic XML Format Provides (Latent) RDF Profile Core Property Set Extensible Typing

YADS– A Description Service (2)

Early API – Java, Perl, Python, Ruby Library Code & XSLT Stylesheets Serializations

YADS/XML (Generic) RDF/XML D (Text Description) SVG *(SRX - SPARQL) *(YAML) *(JSON)

YADS – Use Cases

Co-Hosting: Platforms, Mirror Sites Multi-Homing: Products, Components Rendering: Formats Versioning: Editions Significant “Others”: Errata, Suppl. Material, Etc Service Acquisition: Metadata, Etc

YADS

Model Walkthrough

YADS – Background

Origins Late ‘01 from Early Work on DOI Focus on Multiple Resolution Dealt with Task of Relating Handle Values

Resources Literals & Groups

Introduced Notion of a Handle “Map”

Subsequently Generalized to Model Any Web-Based Resource

YADS – Model Walkthrough

DOI Uses Handle Directory Service DOI Single Resolution

Simple Redirect Service

DOI Multiple Resolution Complex Service Set Requires Resource Selection Requires Resource Semantics

YADS Data Model Manages & Describes Resource Hierarchy

YADS – Single Resource

YADS – Multiple Resources

YADS – Groups

YADS – Containers

YADS – Hierarchy

YADS – Profiles

YADS

Defining the Model

YADS – Schemas

EBNF RDF

RDFS N3 OWL (DAML+OIL)

XML DTD XSD RELAX NG (Schematron, XCSL, XMI, …)

YADS – EBNF

yads = { ( item | nest ) } ; (* Structural elements for aggregating resources & properties *) item = {property}, ( resource | collection ), {property} ; nest = ( {property}, resource, {property}, collection, {property} ) | ( {property}, collection, {property}, resource, {property} ) ; (* Structural element for aggregating structural elements *) collection = group, {group} ; group = item | nest ; (* Resource element as per RFC 3986. *) resource = any-uri ; (* Property elements attributing metadata to resources. *) property = access | detail | directive | label | role | service | type ;

YADS – RDF/N3 @prefix : <#> . @prefix s: <http://www.w3.org/2000/01/rdf-schema> . # Nest class ( :collection & :resource ) :Nest a s:Class . # Item class ( :collection | :resource ) :Item a s:Class . # Resource properties :collection a s:Property ; s:domain :Item, :Nest ; s:range s:Container . :resource a s:Property ; s:domain :Item, :Nest ; s:range s:Resource . # Application properties :access a s:Property ; s:domain :Item, :Nest ; s:range s:Literal . ...

YADS – XSD<xsd:element name = "yads"> <xsd:simpleType> <xsd:choice> <xsd:element ref = "item" minOccurs = "0" maxOccurs = "unbounded"/> <xsd:element ref = "nest" minOccurs = "0" maxOccurs = "unbounded"/> </xsd:choice> </xsd:simpleType></xsd:element>

<xsd:element name = "item"> <xsd:complexType> <xsd:sequence> <xsd:choice> <xsd:element ref = "collection"/> <xsd:element ref = "resource"/> </xsd:choice> <xsd:element ref = "property” minOccurs = "0" maxOccurs = "unbounded"/> </xsd:sequence> </xsd:complexType></xsd:element>...

YADS

Serializing the Model

YADS – Example Object

YADS – Description

doi:1014/waterloo_&_city_line

( # Line branches on line { ( # Line stations on line branch { ( resource => <doi:1014/tube/waterloo> type => "tube:station" access => "Rail Link" ) ( resource => <doi:1014/tube/bank> type => "tube:station" ) } type => "tube:line-branch" ) } type => "tube:line")

YADS – Handle “Map”


INDEX TYPE VALUE

0 map "( { ( { ( 1 2 3 ) ( 4 5 ) } 6 ) } 7 ) "1 resource <doi:1014/tube/waterloo>2 type "tube:station"3 access "Rail Link"4 resource <doi:1014/tube/bank>5 type "tube:station"6 type "tube:line-branch"7 type "tube:line”

YADS – YAMLdoi:1014/waterloo_&_city_line

---- # Line branches on line - - # Line stations on line branch - - resource: doi:1014/tube/waterloo type: tube:station access: Rail Link - resource: doi:1014/tube/bank type: tube:station - type: tube:line-branch - type: tube:line...

YADS – Generic XML


<item> <container> <item> <container> <item> <resource>doi:1014/tube/waterloo</resource> <property type="type">tube:station</property> <property type="access">Rail Link</property> </item> <item> <resource>doi:1014/tube/bank</resource> <property type="type">tube:station</property> </item> </container> <property type="type">tube:line-branch</property> </item> </container> <property type="type">tube:line</property></item>

YADS – Specific XML


# Resources elements are promoted to group level# and are "attributed" with properties

<resource type="tube:line"> <resource type="tube:line-branch"> <resource type="tube:station" access="Rail Link">doi:1014/tube/waterloo</resource> <resource type="tube:station">doi:1014/tube/bank</resource> </resource></resource>

YADS – Application XML (1)doi:1014/waterloo_&_city_line

# Typed resources are named <tube:line> <tube:line-branch> <tube:station access="Rail Link">doi:1014/tube/waterloo </tube:station> <tube:station>doi:1014/tube/bank</tube:station> </tube:line-branch></tube:line>

YADS – Application XML (2)doi:1014/menu_popup

# Application XML instance: Menu Popup <menu label="Further Links"> <menu label="DOI Sites"> <item label="IDF">http://www.doi.org</data> <item label="CNRI">http://www.cnri.reston.va.us</data> </menu></menu>

YADS – Schemas

EBNF RDF

RDFS N3 OWL (DAML+OIL)

XML DTD XSD RELAX NG (Schematron, XCSL, XMI, …)

YADS

Querying the Model

YADS – Querying

Standard Query Languages RDF by SPARQL (XML by XQuery?)

Native Query Facilities API

YADS – SPARQL Query BASE <file:../lib/doi/rdf/format1.rdf> PREFIX yads: <doi:1014/yads-schema-2002-04-03#> SELECT ?s ?p ?o WHERE { ?s ?p ?o }

YADS – SPARQL Results<?xml version="1.0" encoding="utf-8"?><sparql xmlns="http://www.w3.org/2005/sparql-results#"> <head> <variable name="s"/> <variable name="p"/> <variable name="o"/> </head> <results ordered="false" distinct="false"> <result> <binding name="s"><uri>file:../lib/doi/rdf/format1.rdf</uri></binding> <binding name="p"><uri>doi:1014/yads-schema-2002-04-03#collection</uri></binding> <binding name="o"><bnode>r1167855627r26072r1</bnode></binding> </result> <result> <binding name="s"><bnode>r1167855627r26072r5</bnode></binding> <binding name="p"><uri>http://www.w3.org/1999/02/22-rdf-syntax-ns#_1</uri></binding> <binding name="o"><bnode>r1167855627r26072r6</bnode></binding> </result> ...

YADS

Servicing the Model

YADS – Services

YADS

Applying the Model

YADS – Home Page

YADS

http://nurture.nature.com/tony/yads

Yads

Business

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