$Revision: 1.6 $ - $Date: 2006/04/19 16:20:03 $
Abstract
This document provides use cases for the Compact Syntax for Topic Maps (CTM). These use cases should provide criteria to evaluate the existing languages such as AsTMa= and LTM and serve as a basis for discussion in order to create a standard textual topic map notation.
This document is an working draft to collect potential use cases and usage scenarios for a Compact Syntax for Topic Maps (CTM).
This section presents various use case scenarios. It is not meant to be complete, but should serve a base for evaluating the existing notations. Due to lack of a fixed TMQL / TMQL Update (TMQL part II) and TMCL syntax, the authors of this document left out the use cases where CTM should be used to create or update topic maps. The requirement for syntax compatibility between TMQL, TMCL and CTM remains, though.
Assuming that a topic map about the music band The Beatles should be created, we define particular aspects of the topic map authoring task.
This section contains use cases to create topics. Additionally this section defines use cases for creating type-instance relationships between topics. While the type-instance relationship is created with an association, the authors of this document assume that each syntax has a short hand notation for this common use case.
A topic with the item identifier "john" should be created. The topic must not have any further characteristics.
A topic with the item identifier "john" should be created. The type of this topic should be a topic with the item identifier "person". The topic must not have any further characteristics.
A topic with the item identifier "john" should be created. The type of this topic should be a topic with the subject identifier "http://psi.example.org/person". The topic must not have any further characteristics.
A topic with the item identifier "john" should be created. The types of this topic should be a topic with the item identifier "person" and a topic with the item identifier "musician". The topic must not have any further characteristics.
A topic with the item identifier "john" should be created. The types of this topic should be a topic with the subject identifier "http://psi.example.org/person" and a topic with the subject identifier "http://psi.example.org/musician". The topic must not have any further characteristics.
This section contains use cases to create topic names and their variant names.
A topic with the item identifier "john" and with a topic name value "John Lennon" should be created. The topic must not have any further characteristics.
A topic with the subject identifier "http://psi.example.org/The_Beatles" and with a topic name value "The Beatles" should be created. The topic must not have any further characteristics.
A topic with the subject locator "http://beatles.com/" and with a topic name value "Official website of The Beatles" should be created. The topic must not have any further characteristics.
A topic with the item identifier "john" and with a topic name value "John Winston Lennon" should be created. The type of the topic name must be a topic with the item identifier "fullname". The topic must not have any further characteristics.
A topic with the item identifier "john" and with a topic name value "John Winston Lennon" should be created. The type of the topic name must be a topic with the subject identifier "http://psi.example.org/fullname". The topic must not have any further characteristics.
A topic with the item identifier "john" and with a topic name value "John Winston Lennon" should be created. The scope of the topic name must be a topic with the item identifier "fullname". The topic must not have any further characteristics.
A topic with the item identifier "john" and with a topic name value "John Winston Lennon" should be created. The scope of the topic name must be a topic with the subject identifier "http://psi.example.org/fullname". The topic must not have any further characteristics.
A topic with the item identifier "beatles" and with a topic name value "The Beatles" should be created. Another topic name with the value "Fab Four" should be created with a scope consisting of a topic with the item identifier "nickname" and a topic with the item identifier "short". The topic must not have any further characteristics.
A topic with the item identifier "john" and with a topic name value "John Ono Lennon" should be created. The type of the topic name must be a topic with the item identifier "fullname" and the scope of the topic name must be a topic with the item identifier "yoko". The topic must not have any further characteristics.
A topic with the item identifier "john" and with the topic name value "John Lennon" should be created. The topic name must have a variant in a scope consisting of a topic with the item identifier "sortname". The value of the variant must be "lennon, john" and the datatype must be "http://www.w3.org/2001/XMLSchema#string". The topic must not have any further characteristics.
A topic with the item identifier "john" and with the topic name value"John Lennon" should be created. The topic name must have a variant that has a scope consisting of a topic with the item identifier "markup". The value of the variant must be "<b>John Lennon</b>" and the datatype must be "http://www.w3.org/2001/XMLSchema#anyType". The topic must not have any further characteristics.
A topic with the item identifier "john" and a topic name with the value "John Lennon" should be created. The topic name should have a variant that has a scope consisting of a topic with the item identifier "imagehttp://en.wikipedia.org/wiki/Image:Jk_beatles_john.jpg" and the datatype must be "http://www.w3.org/2001/XMLSchema#anyURI".
A topic with the item identifier "revolution-nine" and a topic name with the value "Revolution 9" should be created. The topic name should have a variant that has a scope consisting of a topic with the item identifier "number9" and the datatype must be "http://www.w3.org/2001/XMLSchema#integer".
This section defines use cases for creating occurrences.
A topic with the item identifier "adayinthelife" and an occurrence with the value "I read the news today, oh boy" should be created. The datatype of this occurrence must be "http://www.w3.org/2001/XMLSchema#string". The topic must not have any further characteristics.
A topic with the item identifier "adayinthelife" and an occurrence with the value "I read the news today, oh boy" should be created. The type of the occurrence must be a topic with the item identifier "lyrics". The datatype of this occurrence must be "http://www.w3.org/2001/XMLSchema#string". The topic must not have any further characteristics.
A topic with the item identifier "adayinthelife" and an occurrence with the value "I read the news today, oh boy" should be created. The type of the occurrence must be a topic with the subject identifier "http://psi.example.org/lyrics". The datatype of this occurrence must be "http://www.w3.org/2001/XMLSchema#string". The topic must not have any further characteristics.
A topic with the item identifier "adayinthelife" and an occurrence with the value "I read the news today, oh boy" should be created. The scope of the occurrence must be a topic with the item identifier "en". The datatype of this occurrence must be "http://www.w3.org/2001/XMLSchema#string". The topic must not have any further characteristics.
A topic with the item identifier "adayinthelife" and an occurrence with the value "I read the news today, oh boy" should be created. The scope of the occurrence must be a topic with the subject identifier "http://www.topicmaps.org/xtm/1.0/language.xtm#en". The datatype of this occurrence must be "http://www.w3.org/2001/XMLSchema#string". The topic must not have any further characteristics.
A topic with the item identifier "adayinthelife" and an occurrence with the value "<html><head><title>A day in the life</title></head><body><p>I read the news today, oh boy</p></body></html>" should be created. The datatype of this occurrence must be "http://www.w3.org/2001/XMLSchema#anyType". The topic must not have any further characteristics.
This sections defines use cases to create associations and association roles.
An association with a type consisting of a topic with the item identifier "created-by" should be created. A topic with the item identifier "yesterday" should play the role of type "work". Another topic with the item identifier "mccartney" should be the player of the role type "creator".
An association with a type consisting of a topic with the item identifier "created-by" should be created. The scope of the association constists of a topic with the item identifier "inofficial". A topic with the item identifier "yesterday" should play the role of type "work". Another topic with the item identifier "mccartney" should be the player of the role type "creator".
An association with a type consisting of a topic with the subject identifier "http://psi.topicmaps.com/iso13250/supertype-subtype" should be created. A topic with the item identifier "song" should play the role of type "http://psi.topicmaps.com/iso13250/subtype". Another topic with the item identifier "musical-work" should be the player of the role type "http://psi.topicmaps.com/iso13250/supertype".
An association with a type consisting of a topic with the subject identifier "http://psi.topicmaps.com/iso13250/supertype-subtype" should be created. A topic with the subject identifier "http://psi.example.org/song" should play the role of type "http://psi.topicmaps.com/iso13250/subtype". Another topic with the subject identifier "http://psi.example.org/musical-work" should be the player of the role type "http://psi.topicmaps.com/iso13250/supertype".
While the act of reification is well defined inside the (de)serialization process of XTM, the CTM syntax may define another, more explicit reification notation that is conform to the Topic Maps - Data Model (TMDM). The following use cases assume that there is no need to use item identifiers / subject identifiers to support reification.
The topic map itself should be reified by a topic with a topic name value "Topic Map about The Beatles".
A topic with the item identifier "john" should be created. The topic should have a topic name with the value "John Ono Lennon". The topic name should be reified by a topic.
A topic with the item identifier "john" and with the topic name value "John Lennon" should be created. The topic name must have a variant in a scope consisting of a topic with the item identifier "sortname". The value of the variant must be "lennon, john" and the datatype must be "http://www.w3.org/2001/XMLSchema#string". The variant name should be reified by a topic.
A topic with the item identifier "john" should be created. The topic should have an occurrence with the value "http://johnlennon.com/" of datatype "http://www.w3.org/2001/XMLSchema#anyURI". The occurrence should be reified by a topic with the topic name value "Official website of John Lennon".
An association with a type consisting of a topic with the item identifier "partnership" should be created. The association consists of two roles. Both association roles are typed by a topic with the item identifier "partner". One player is a topic with the item identifier "lennon" the other player is a topic with the item identifier "mccartney". This association must be reified by a topic with a topic name value "Lennon / McCartney".
The CTM should support directives to make the authoring task easier.
An existing topic map with the URI http://example.org/topicmaps/beatles should be merged with the currently edited topic map. The syntax of the encoded topic map under the given URI should be provided (either XTM or CTM).
The encoding of the topic map content should be made explicit at the document header.
The CTM should support comments to annotate the topic map content.
A single line comment sould be created:
This is a topic map about The BeatlesA comment spanning mutliple lines sould be created:
This is a topic map about The Beatles
Authored by John Doe
CTM MAY support a notation for a particular ordering. I.e. express that "Lovely Rita" is the 3rd song on the side 2 of the LP "Sgt. Pepper's Lonely Hearts Club Band"
To get an impression how a medium sized topic map in the various notations looks like, we define a topic map in the above mentioned problem domain.
The solutions may use any syntactic sugar to define the topic map that meets the provided requirements.
To the solution providers: Please comment the created topic maps well, especially if the solution contains constructs that may not be obvious for a reader who does not know the notation.
<?xml version="1.0" encoding="ISO-8859-1"?>
<topicMap xmlns="http://www.topicmaps.org/xtm/1.0/"
xmlns:xlink="http://www.w3.org/1999/xlink"
id="beatles-map">
<!-- Reifies the topic map -->
<topic id="beatles-topic">
<subjectIdentity>
<subjectIndicatorRef xlink:href="#beatles-map"/>
</subjectIdentity>
<baseName>
<baseNameString>Topic map about The Beatles</baseNameString>
</baseName>
</topic>
<topic id="group">
<baseName>
<baseNameString>group</baseNameString>
</baseName>
</topic>
<!-- Music group -->
<topic id="music-group">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://psi.example.org/music/muscial-group"/>
</subjectIdentity>
<baseName>
<baseNameString>Music group</baseNameString>
</baseName>
</topic>
<!-- Music group is subclass of group -->
<association>
<instanceOf>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass-subclass"/>
</instanceOf>
<member>
<roleSpec>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass"/>
</roleSpec>
<topicRef xlink:href="#group"/>
</member>
<member>
<roleSpec>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#subclass"/>
</roleSpec>
<topicRef xlink:href="#music-group"/>
</member>
</association>
<!-- Assoc. types -->
<topic id="created-by">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://psi.example.org/created-by"/>
</subjectIdentity>
<baseName>
<baseNameString>created by</baseNameString>
</baseName>
</topic>
<topic id="creator">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://purl.org/dc/elements/1.1/creator"/>
</subjectIdentity>
<baseName>
<baseNameString>Creator</baseNameString>
</baseName>
</topic>
<topic id="track-of">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://psi.test.org/assoc#istrackof"/>
</subjectIdentity>
<baseName>
<baseNameString>is track of</baseNameString>
</baseName>
</topic>
<topic id="superclass-subclass">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass-subclass"/>
</subjectIdentity>
<baseName>
<baseNameString>superclass subclass relationship</baseNameString>
</baseName>
</topic>
<topic id="superclass">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass"/>
</subjectIdentity>
<baseName>
<baseNameString>superclass</baseNameString>
</baseName>
</topic>
<topic id="subclass">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#subclass"/>
</subjectIdentity>
<baseName>
<baseNameString>subclass</baseNameString>
</baseName>
</topic>
<topic id="work">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://psi.example.org/work"/>
</subjectIdentity>
<baseName>
<baseNameString>work</baseNameString>
</baseName>
</topic>
<!-- Musical work -->
<topic id="musical-work">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://psi.example.org/music/muscial-work"/>
</subjectIdentity>
<instanceOf><topicRef xlink:href="#work"/></instanceOf>
<baseName>
<baseNameString>Musical work</baseNameString>
</baseName>
</topic>
<!-- Song -->
<topic id="song">
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/music/song"/>
</subjectIdentity>
<baseName>
<baseNameString>song</baseNameString>
</baseName>
<baseName>
<scope>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/language.xtm#de"/>
</scope>
<baseNameString>Lied</baseNameString>
</baseName>
</topic>
<topic id="track">
<baseName>
<baseNameString>track</baseNameString>
</baseName>
</topic>
<topic id="container">
<baseName>
<baseNameString>container</baseNameString>
</baseName>
</topic>
<!-- Song is a subclass of musical work -->
<association>
<instanceOf>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass-subclass"/>
</instanceOf>
<member>
<roleSpec>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass"/>
</roleSpec>
<topicRef xlink:href="#musical-work"/>
</member>
<member>
<roleSpec>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#subclass"/>
</roleSpec>
<topicRef xlink:href="#song"/>
</member>
</association>
<!-- Instrumental -->
<topic id="instrumental">
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/music/instrumental"/>
</subjectIdentity>
<baseName>
<baseNameString>instrumental</baseNameString>
</baseName>
<occurrence>
<instanceOf>
<topicRef xlink:href="#description"></topicRef>
</instanceOf>
<resourceData>Instrumental indicates that a musical work that is performed by instruments only.</resourceData>
</occurrence>
</topic>
<!-- instrumental is a subclass of musical work -->
<association>
<instanceOf>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass-subclass"/>
</instanceOf>
<member>
<roleSpec>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#superclass"/>
</roleSpec>
<topicRef xlink:href="#musical-work"/>
</member>
<member>
<roleSpec>
<subjectIndicatorRef
xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#subclass"/>
</roleSpec>
<topicRef xlink:href="#instrumental"/>
</member>
</association>
<!-- Album -->
<topic id="album">
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.test.org/music#album"/>
</subjectIdentity>
<baseName>
<baseNameString>album</baseNameString>
</baseName>
</topic>
<!-- Person -->
<topic id="person">
<subjectIdentity>
<subjectIndicatorRef xlink:href="http://psi.test.org/person"/>
</subjectIdentity>
<baseName>
<baseNameString>person</baseNameString>
</baseName>
</topic>
<topic id="member">
<baseName>
<baseNameString>member</baseNameString>
</baseName>
</topic>
<!-- John Lennon -->
<topic id="john">
<instanceOf>
<topicRef xlink:href="#person"></topicRef>
</instanceOf>
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/music/beatles/john"/>
</subjectIdentity>
<baseName>
<baseNameString>John Lennon</baseNameString>
<variant>
<parameters>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#sort"></subjectIndicatorRef>
</parameters>
<variantName>
<resourceData>lennon, john</resourceData>
</variantName>
</variant>
</baseName>
</topic>
<!-- Paul McCartney -->
<topic id="paul">
<instanceOf>
<topicRef xlink:href="#person"></topicRef>
</instanceOf>
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/music/beatles/paul"/>
</subjectIdentity>
<baseName>
<baseNameString>Paul McCartney</baseNameString>
<variant>
<parameters>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#sort"></subjectIndicatorRef>
</parameters>
<variantName>
<resourceData>mccartney, paul</resourceData>
</variantName>
</variant>
</baseName>
</topic>
<!-- Ringo Starr -->
<topic id="ringo">
<instanceOf>
<topicRef xlink:href="#person"></topicRef>
</instanceOf>
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/music/beatles/ringo"/>
</subjectIdentity>
<baseName>
<baseNameString>Ringo Starr</baseNameString>
<variant>
<parameters>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#sort"></subjectIndicatorRef>
</parameters>
<variantName>
<resourceData>starr, ringo</resourceData>
</variantName>
</variant>
</baseName>
</topic>
<!-- George Harrison -->
<topic id="george">
<instanceOf>
<topicRef xlink:href="#person"></topicRef>
</instanceOf>
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/music/beatles/george"/>
</subjectIdentity>
<baseName>
<baseNameString>George Harrison</baseNameString>
<variant>
<parameters>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#sort"></subjectIndicatorRef>
</parameters>
<variantName>
<resourceData>harrison, george</resourceData>
</variantName>
</variant>
</baseName>
</topic>
<!-- The Beatles -->
<topic id="thebeatles">
<instanceOf>
<topicRef xlink:href="#music-group"></topicRef>
</instanceOf>
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/music/beatles/the%20beatles"/>
</subjectIdentity>
<baseName>
<baseNameString>The Beatles</baseNameString>
<variant>
<parameters>
<subjectIndicatorRef xlink:href="http://www.topicmaps.org/xtm/1.0/core.xtm#sort"></subjectIndicatorRef>
</parameters>
<variantName>
<resourceData>beatles, the</resourceData>
</variantName>
</variant>
</baseName>
<occurrence>
<instanceOf>
<topicRef xlink:href="#website"/>
</instanceOf>
<resourceRef xlink:href="http://thebeatles.com/"/>
</occurrence>
</topic>
<topic id="membership">
<baseName>
<baseNameString>Membership</baseNameString>
</baseName>
<baseName>
<scope><topicRef xlink:href="#group"/></scope>
<baseNameString>has member</baseNameString>
</baseName>
<baseName>
<scope><topicRef xlink:href="#member"/></scope>
<baseNameString>is member of</baseNameString>
</baseName>
</topic>
<!-- Members of The Beatles -->
<association>
<instanceOf>
<topicRef xlink:href="#membership"/>
</instanceOf>
<member>
<roleSpec><topicRef xlink:href="#member"/></roleSpec>
<topicRef xlink:href="#john"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#group"/></roleSpec>
<topicRef xlink:href="#thebeatles"/>
</member>
</association>
<association>
<instanceOf>
<topicRef xlink:href="#membership"/>
</instanceOf>
<member>
<roleSpec><topicRef xlink:href="#member"/></roleSpec>
<topicRef xlink:href="#paul"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#group"/></roleSpec>
<topicRef xlink:href="#thebeatles"/>
</member>
</association>
<association>
<instanceOf>
<topicRef xlink:href="#membership"/>
</instanceOf>
<member>
<roleSpec><topicRef xlink:href="#member"/></roleSpec>
<topicRef xlink:href="#george"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#group"/></roleSpec>
<topicRef xlink:href="#thebeatles"/>
</member>
</association>
<association>
<instanceOf>
<topicRef xlink:href="#membership"/>
</instanceOf>
<member>
<roleSpec><topicRef xlink:href="#member"/></roleSpec>
<topicRef xlink:href="#ringo"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#group"/></roleSpec>
<topicRef xlink:href="#thebeatles"/>
</member>
</association>
<!-- The Lennon/McCartney partnership -->
<topic id="lennon-mccartney-reifier">
<subjectIdentity>
<subjectIndicatorRef xlink:href="#lennon-mccartney"/>
</subjectIdentity>
<baseName>
<baseNameString>Lennon / McCartney</baseNameString>
</baseName>
</topic>
<association id="lennon-mccartney">
<instanceOf>
<topicRef xlink:href="#partnership"/>
</instanceOf>
<member>
<roleSpec><topicRef xlink:href="#partner"/></roleSpec>
<topicRef xlink:href="#paul"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#partner"/></roleSpec>
<topicRef xlink:href="#john"/>
</member>
</association>
<topic id="partner">
<baseName>
<baseNameString>partner</baseNameString>
</baseName>
</topic>
<topic id="partnership">
<baseName>
<baseNameString>partnership</baseNameString>
</baseName>
</topic>
<topic id="website">
<baseName>
<baseNameString>website</baseNameString>
</baseName>
</topic>
<topic id="description">
<baseName>
<baseNameString>description</baseNameString>
</baseName>
</topic>
<topic id="length">
<baseName>
<baseNameString>length</baseNameString>
</baseName>
</topic>
<topic id="lyrics">
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.example.org/lyrics"/>
</subjectIdentity>
<baseName>
<baseNameString>lyrics</baseNameString>
</baseName>
<occurrence>
<instanceOf>
<topicRef xlink:href="#description"/>
</instanceOf>
<resourceData>The text of a song</resourceData>
</occurrence>
</topic>
<!-- Album -->
<topic id="sgtpepper-album">
<instanceOf>
<topicRef xlink:href="#album"></topicRef>
</instanceOf>
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.testing.org/beatles/album/sgtpepper"/>
</subjectIdentity>
<baseName>
<baseNameString>Sgt. Pepper's Lonely Hearts Club Band</baseNameString>
</baseName>
</topic>
<topic id="mmt-album">
<instanceOf>
<topicRef xlink:href="#album"></topicRef>
</instanceOf>
<subjectIdentity>
<subjectIndicatorRef
xlink:href="http://psi.testing.org/beatles/album/magicalmysterytour"/>
</subjectIdentity>
<baseName>
<baseNameString>Magical Mystery Tour</baseNameString>
</baseName>
</topic>
<!-- Songs -->
<topic id="flying">
<instanceOf>
<topicRef xlink:href="#instrumental"></topicRef>
</instanceOf>
<baseName>
<baseNameString>Fyling</baseNameString>
</baseName>
<occurrence>
<instanceOf>
<topicRef xlink:href="#length"></topicRef>
</instanceOf>
<resourceData>2:16</resourceData>
</occurrence>
</topic>
<topic id="adayinthelife">
<instanceOf>
<topicRef xlink:href="#song"></topicRef>
</instanceOf>
<baseName>
<baseNameString>A day in the life</baseNameString>
</baseName>
<occurrence>
<instanceOf>
<topicRef xlink:href="#length"></topicRef>
</instanceOf>
<resourceData>5:03</resourceData>
</occurrence>
<occurrence>
<instanceOf>
<topicRef xlink:href="#lyrics"/>
</instanceOf>
<resourceData>I read the news today oh, boy
About a lucky man who made the grade
And though the news was rather sad
Well, I just had to laugh
I saw the photograph
He blew his mind out in a car
[...]
</resourceData>
</occurrence>
</topic>
<association>
<instanceOf>
<subjectIndicatorRef xlink:href="http://psi.example.org/created-by"/>
</instanceOf>
<member>
<roleSpec>
<subjectIndicatorRef xlink:href="http://purl.org/dc/elements/1.1/creator"/>
</roleSpec>
<topicRef xlink:href="#lennon-mccartney-reifier"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#work"/></roleSpec>
<topicRef xlink:href="#adayinthelife"/>
</member>
</association>
<association>
<instanceOf>
<subjectIndicatorRef xlink:href="http://psi.example.org/created-by"/>
</instanceOf>
<member>
<roleSpec>
<subjectIndicatorRef xlink:href="http://purl.org/dc/elements/1.1/creator"/>
</roleSpec>
<topicRef xlink:href="#thebeatles"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#work"/></roleSpec>
<topicRef xlink:href="#flying"/>
</member>
</association>
<!-- Connection song to album -->
<association>
<instanceOf>
<subjectIndicatorRef xlink:href="http://psi.test.org/assoc#istrackof"/>
</instanceOf>
<member>
<roleSpec>
<topicRef xlink:href="#container"/>
</roleSpec>
<topicRef xlink:href="#mmt-album"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#track"/></roleSpec>
<topicRef xlink:href="#flying"/>
</member>
</association>
<association>
<instanceOf>
<subjectIndicatorRef xlink:href="http://psi.test.org/assoc#istrackof"/>
</instanceOf>
<member>
<roleSpec>
<topicRef xlink:href="#container"/>
</roleSpec>
<topicRef xlink:href="#sgtpepper-album"/>
</member>
<member>
<roleSpec><topicRef xlink:href="#track"/></roleSpec>
<topicRef xlink:href="#adayinthelife"/>
</member>
</association>
</topicMap>