Hatana - Virtual Topic Map Merging

TMRA
2010

Hatana

A
virtual
merging
engine

Uta
Schulze

Topic
Maps
Lab
at
the
University
of
Leipzig

Uta.Schulze@informaBk.uni-‐leipzig.de

Einführung
in
Topic
Maps

"Accessing the island of Hatana is a complicated process."
http://en.wikipedia.org/wiki/Hatana

Uta Schulze, Topic Maps Lab
<Uta.Schulze@informatik.uni-leipzig.de>

Einführung
in
Topic
Maps

MoBvaBon
-‐
Not
that
complicated

Several data sources

One view?


Einführung
in
Topic
Maps

MoBvaBon
-‐
Not
that
complicated


One query language?


Einführung
in
Topic
Maps

MoBvaBon
-‐
Not
that
complicated


?

Einführung
in
Topic
Maps

Why
puJng
data
into
topic
maps?

MaJorToM-JLI
Because we can.

ARNotations

Coming
soon
Maiana


Einführung
in
Topic
Maps

Why
puJng
data
into
topic
maps?

Because we can.
Because information wants to be a topic map.


Einführung
in
Topic
Maps

Why
puJng
data
into
topic
maps?

Because we can.
Because information wants to be a topic map.
Because we’d like to merge…


Einführung
in
Topic
Maps

Why
don‘t
we
just
put
everything
into
one
big
topic
map
and
are
done
with?

Information
1.  changes over time


Einführung
in
Topic
Maps

Why
don‘t
we
just
put
everything
into
one
big
topic
map
and
are
done
with?

Information
2.  has copyright issues


Einführung
in
Topic
Maps

Why
don‘t
we
just
put
everything
into
one
big
topic
map
and
are
done
with?

Information
3.  has an origin that would get lost


Einführung
in
Topic
Maps

Why
don‘t
we
just
put
everything
into
one
big
topic
map
and
are
done
with?

Information
3.  has an origin that would get lost
4.  should sometimes remain in its database


Einführung
in
Topic
Maps

Another
soluBon:
Hatana

Hatana creates a layer over several data sources.


Einführung
in
Topic
Maps

Another
soluBon:
Hatana

Hatana creates a layer over several data sources.

This layer behaves as a topic map!


Einführung
in
Topic
Maps

Example
1:
TMRA
ParBcipants
(Java
Live
IntegraBon)


Einführung
in
Topic
Maps

Hatana
merges
...

•  strictly according to the TMDM’s equality rules of constructs
•  on demand
•  and creates „virtual” topics, associations, …


Einführung
in
Topic
Maps

Equality
rules
for
topics

Graham Moore, Graham Moore, Graham Moore,
Vice Admiral Footballer Topic Mapper


Einführung
in
Topic
Maps

Equality
rules
for
topics


NAME EQUALITY


Einführung
in
Topic
Maps

Equality
rules
for
topics

http://en.wikipedia.org/wiki/Graham_Moore_(footballer)


http://en.wikipedia.org/wiki/Graham_Moore

http://www.topicmapslab.de/people/Graham_Moore


Einführung
in
Topic
Maps

Equality
rules
for
topics

http://en.wikipedia.org/wiki/Graham_Moore_(footballer)


http://en.wikipedia.org/wiki/Graham_Moore


IDENTIFIER EQUALITY

Einführung
in
Topic
Maps

Virtual
on
demand
merging

http://www.topicmapslab.de/people/
Graham_Moore


Einführung
in
Topic
Maps

Virtual
on
demand
merging

Graham_Moore

http://psi.ontopedia.net/Graham_Moore


Einführung
in
Topic
Maps

Virtual
on
demand
merging

Graham_Moore




Einführung
in
Topic
Maps

Virtual
on
demand
merging

Graham_Moore

virtual topic


Einführung
in
Topic
Maps

Virtual
on
demand
merging

virtual names

get all names

virtual topic


Einführung
in
Topic
Maps

Virtual
on
demand
merging

Virtual topic

•  empty
•  wrapper that
•  acts as topic ...
•  but stores ids of equal source topics


Einführung
in
Topic
Maps

Example
2:
Merging
the
Italian
and
Norwegian
Opera

Problem
•  only 20 out of 2767 topics with equal identifiers
•  http://psi.ontopia.net/music/opera vs. http://psi.ontopedia.net/Opera
•  no editing of sources


Einführung
in
Topic
Maps

Example
2:
Merging
the
Italian
and
Norwegian
Opera

Problem
•  Only 20 out of 2767 topics with same identifiers
•  http://psi.ontopia.net/music/opera vs. http://psi.ontopedia.net/Opera
•  No editing of sources

Possible solution
•  topic map with topic containing e.g. both „Opera“ identifiers
•  source: expert knowledge, Subj3ct, ...


Einführung
in
Topic
Maps

Advantages
of
virtual
merging

•  Combining read-only topic maps
•  Combining private with public available topic maps (Maiana feature)
•  Information about the origin
•  On demand merging
•  Playing around with identities
•  Validating topic map against a schema, database backend


Einführung
in
Topic
Maps

Performance

•  There is runtime
•  Highly dependent of the underlying engine


Einführung
in
Topic
Maps

Performance


•  Validation of the opera map against the TMCL Meta Schema:
•  hard merge using Ontopia: instantly
•  improved Hatana version: took quite some time


Einführung
in
Topic
Maps

Performance


•  more improved Hatana version: a moment


Einführung
in
Topic
Maps

Performance


•  future Hatana version: ?


Einführung
in
Topic
Maps

ImplementaBon

•  read-only Java topic maps engine (TMAPI)
•  Topic Map System containing virtual topic maps
•  Virtual construct: empty layer storing the ids of its source constructs
•  Caching: Id-Storing


Einführung
in
Topic
Maps

I
did
not
talk
about

•  Merging topics that reify e.g. equal names
•  Merging associations and roles
•  most time consuming
•  Cache invalidation


Einführung
in
Topic
Maps

Next
steps

•  Learning from Jack Park’s merge assertions
•  Implementing the Container in Container feature
•  Increasing performance
•  Improving the Container view in Maiana


Einführung
in
Topic
Maps

Thank you for your attention!


Hatana - Virtual Topic Map Merging

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