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The information integration wizard (Iwiz) project. Report on work in progress Joachim Hammer Presented by Muhammed Al-Muhammed. introduction. people use internet to find information of interest.

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the information integration wizard iwiz project

The information integration wizard (Iwiz) project

Report on work in progress

Joachim Hammer

Presented by

Muhammed Al-Muhammed

introduction

introduction

people use internet to find information of interest.

* that is easy if all information available in the same

place.

- But this not the case nowadays!

The information of interest could be located in multiple

sources. So what we can do?

- if all sources use the same tools and data modeling to

create and manage their data the problem of finding

information of interest is no longer problem!

slide3
but what if these sources use different tools, hardware , software platforms to manage their data (heterogeneity at a peak).

What possible problems? Some could be:

- schematic problems.

- semantics problems.

So what can we do? Obvious

solution is to use a tool the can overcome

heterogeneity problems and decentralization

of information sources. This the reason why the data integration is important.

slide4
So what benefits users get out of data integration

tools? The greatest benefits are :

1.the user does not have to worry about what

sources are available;

2. where they are located;

3. how the data is represented in each source;

4.and how each data source is queried;

slide6
Goals of the project

help users get information from heterogeneous

sources. How they achieve this goal?

Build integration system using hybrid data

“warehousing / Mediators” approach.

Warehousing stores frequently accessed data.

Mediator supports on-demand queries if the data is

not available in the warehouse.

slide7
What issues must be investigated in order to achieve these goals?

Common data model and representation, I.e. what data model can be used to represent the information in the integrated system?. They chose XML for their system. Because it has some nice features such as clear separation of the data and schema.

slide8
2. Defining global schema to provide a

representation of relevant data tailored to the

user’s needs.3. Semantic heterogeneities (huge problem)

what hurdles caused by heterogeneity:

- understanding the meaning of the source data

- relating it to the global schema.

- translate values from source to target context

- merging related data

slide9
heterogeneity faced at 3 levels: - System level :Hardware, operating system. - Data management :difference in the data models, access commands.. - Semantic level :the difference in the way related or similar data is represented in different sources.
slide10
How the three levels of heterogeneity can be overcome?

The first two are overcome by translators and adapters.

The third one is the serious one!

The following diagram gives some idea about the kind of heterogeneities.

slide12
So what we can do to deal with heterogeneity problem?

* To overcome heterogeneity, mapping

needed.

  • Mapping can be done by two steps

1- schema restructuring; eliminate syntax

and semantic inconsistencies between the

source schema and global schema.

2- schema merging; removal duplications,

removal of inconsistent data ..

slide13
4- Knowledge representation; a common metadata knowledgebase to reason about the meaning of and relationships among concepts.

“To deal with the issues, they proposed a system called Iwiz.”

- Iwiz architecture

slide15
Restructuring and Merging

The goals of this are:

1- generate rules for converting data from its native source  global schema.

2- populate the global target schema with data.

How the data restructured and merged?

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