Is Your Data Facility ISO Compliant?

Progress Towards Harmonizing the DDI and ISO/IEC 11179

Dan Gillman

Information Scientist

US Bureau of Labor Statistics

28 May 2003 IASSIST 2003 - Strength in Numbers

2

Introduction

• Quick Overview of ISO/IEC 11179• WebDAIS• WebDAIS Model

– Data Set Model– Variable Model

• ISO/IEC 11179

– Cube Model– Container Model– Administration Model– Miscellaneous Model

28 May 2003 IASSIST 2003 - Strength in Numbers

3

ISO/IEC 11179

• 6 Part International Standard– First version completed in 2000

• Under revision– Old - Specification and standardization of data

elements– New - Metadata registries

• All freely available at ISO web site– www.iso.ch

28 May 2003 IASSIST 2003 - Strength in Numbers

4

WebDAIS Harmonization

• Health Canada

• NESSTAR

• WebDAIS system– Harmonization of DDI, ISO/IEC 11179, DAIS

28 May 2003 IASSIST 2003 - Strength in Numbers

5

WebDAIS Harmonization

WebDAIS

DAIS

DDI

ISO/IEC 11179

28 May 2003 IASSIST 2003 - Strength in Numbers

6

WebDAIS Harmonization

...expected information flow

ISO-11179Metadataregistry

webDAISMetadataregistry

...othermetadatasources

DAISPublisher

DDMS

On-line access

DatametadataExport

28 May 2003 IASSIST 2003 - Strength in Numbers

7

WebDAIS Model

• Imported from ISO/IEC 11179– Administration functions

• WebDAIS will act as a registry

– Concept management• Enables harmonization of data

• Future– Build model for DDI– Harmonize with ISO/IEC 11179

28 May 2003 IASSIST 2003 - Strength in Numbers

8

WebDAIS Model

• Model Components– Data Set Model– Variable Model– Cube Model– Container Model– Administration Model– Miscellaneous Model

28 May 2003 IASSIST 2003 - Strength in Numbers

9

WebDAIS Model

• Data Set Model– DDI Perspective– New – Link to Variables

• Variables Associated with Many Data Sets

28 May 2003 IASSIST 2003 - Strength in Numbers

10

WebDAIS Model

• Variable Model (ISO/IEC 11179)– Conceptual

• Object Class (i.e., Population)– A set of objects on which observations are taken

• Property (i.e., Characteristic)– A feature that describes or distinguishes objects

• Data Element Concept– The concept formed by Object Class + Property

28 May 2003 IASSIST 2003 - Strength in Numbers

11

WebDAIS Model

• Variable Model (ISO/IEC 11179)– Representational

• Permissible Value– A value and the value meaning

• Value Domain– A set of permissible values

• Conceptual Domain– A set of value meanings

28 May 2003 IASSIST 2003 - Strength in Numbers

12

WebDAIS Model

• Variable Model (ISO/IEC 11179)– Data Element

• Association of a DEC and a VD

– ISO/IEC 11179 Core Model– Examples

28 May 2003 IASSIST 2003 - Strength in Numbers

13

ISO/IEC 11179 - Core Model

Data Element Value Domain

Data Element Concept Conceptual Domain

Conceptual

Representational

Variables Values

28 May 2003 IASSIST 2003 - Strength in Numbers

14

WebDAIS Model

• Variable Model (ISO/IEC 11179) – Example– Two Value Domains - Marital Status Codes

– MSC 1 MSC 2• M; Married M; Married• S; Never Married S; Not

Married• D; Divorced• W; Widowed

28 May 2003 IASSIST 2003 - Strength in Numbers

15

WebDAIS Model

• Variable Model (ISO/IEC 11179) - Example– Two Data Element Concepts

• DEC 1– Object Class -- Employees of BLS

– Property -- Marital Status

• DEC 2– Object Class -- Adult Residents of Ontario

– Property -- Marital Status

28 May 2003 IASSIST 2003 - Strength in Numbers

16

WebDAIS Model

Data Elements - 4 Possibilities (ISO/IEC 11179)

Emp-MS

MSC 1

Res-MS

MSC 2

DEC -->

VD -->

DE -->

28 May 2003 IASSIST 2003 - Strength in Numbers

17

WebDAIS Model

• Cube Model– Strictly from DDI– Not in ISO/IEC 11179

28 May 2003 IASSIST 2003 - Strength in Numbers

18

WebDAIS Model

• Container Model– Classification Scheme (ISO/IEC 11179)

• Bookmark List– Client Side – List of useful URLs

• Browse List– Server Side – Classify Objects by Server

• Variable Groups– Link Group of Variables, Based on Business Requirement

28 May 2003 IASSIST 2003 - Strength in Numbers

19

WebDAIS Model

• Administration Model (ISO/IEC 11179)– Data Archive

• Data Library Metadata Registry– ISO/IEC 11179 Metadata Registry – Really a Data

Element + Value Domain + Concept Registry

– Example – Car Registry

• Card Catalog Administered Items

• Catalog Items Model Attributes

28 May 2003 IASSIST 2003 - Strength in Numbers

20

WebDAIS Model

• Administration Model (ISO/IEC 11179)– What Do You Want to Keep Track of?

• Descriptions of Objects

– What Kind of Objects?• DDI?? Data sets

• ISO/IEC 11179 Data Elements + Value Domains

– Administered Item Description of an Object

28 May 2003 IASSIST 2003 - Strength in Numbers

21

WebDAIS Model

• Administration Model (ISO/IEC 11179)– Registration -

• Registration is the process whereby unambiguous identifiers are formally associated with objects.

– Administration -• Manages life-cycle of descriptions

– Administration records

• Monitors quality of metadata– Registration status

– Applies to scope of registry, not just core model

28 May 2003 IASSIST 2003 - Strength in Numbers

22

WebDAIS Model

• Miscellaneous Model– Other Stuff

28 May 2003 IASSIST 2003 - Strength in Numbers

23

Differences among DDI, DAIS, and ISO/IEC 11179

• DDI– Subject matter specific– End user perspective - “Metadata after the data”– XML DTD - not UML model– Data set oriented– Document oriented - codebook– “Study” is highest level of abstraction

28 May 2003 IASSIST 2003 - Strength in Numbers

24

Differences among DDI, DAIS, and ISO/IEC 11179

• ISO/IEC 11179– Independent of particular subject matter– Producer perspective - “Metadata before the data”– UML model– Data and database oriented– “Concept” is highest level of abstraction– “Administration” is highest level of function

28 May 2003 IASSIST 2003 - Strength in Numbers

25

Differences among DDI, DAIS, and ISO/IEC 11179

• DAIS– Concept of variable group

• Not a DEC

• May be added to ISO/IEC 11179

Contact

Dan Gillman

Gillman.Daniel@BLS.Gov

+1.202.691.7523