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Subcommittee 3D DATA SETS FOR LIBRARIES

Subcommittee 3D DATA SETS FOR LIBRARIES. Exchange of dictionary data Cape Town, 2005-10-19 3(Cape Town/Radley)3. Donald Radley Chairman, SC3D. Contents. Dictionary data exchange Exchange formats Problems with special characters Format conversion Dictionary validation Demonstrations.

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Subcommittee 3D DATA SETS FOR LIBRARIES

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  1. Subcommittee 3D DATA SETS FOR LIBRARIES

  2. Exchange of dictionary dataCape Town, 2005-10-193(Cape Town/Radley)3 Donald Radley Chairman, SC3D

  3. Contents • Dictionary data exchange • Exchange formats • Problems with special characters • Format conversion • Dictionary validation • Demonstrations

  4. Dictionary data exchange • Computer-sensible data is essential for application of a data dictionary • Exchange formats must be agreed between supplier and user • It is not reasonable to expect all users to adopt the same format with their associated tools • It follows that dictionaries should be made available in more than one format, or tools be provided to convert among formats

  5. Exchange formats • HTML – as exported from IEC dictionary • STEP Physical File format complying with ISO 10303-21 • TAB-separated, CSV or other tabular formats compatible with spreadsheets • XML – DTD or schema • Simple ASCII tagged format

  6. Problems with special characters • Non-ASCII characters (Greek letters, subscripts, superscripts) cause problems • In principle, Unicode (UTF-8) can be used to represent Greek and other special characters • Unicode appears to support only a few subscripts and superscripts • Use of Unicode varies from format to format • Conversion tools need to take this into account • Transfer of special characters across applications is not transparent

  7. Unicode examples • Greek letter α(alpha) • Unicode value • Decimal 945 • Hexadecimal 03B1 • HTML and SGML - α (or α) • XML – α • α is not accepted • SPF – \X2\03B1\X0\

  8. Format conversion • Tools for conversion between formats are essential • Commercial tools exist for handling SPF and XML files and character-separated tables • Few tools exist for conversion, for example from SPF to XML or vice-versa • Validation of conversion tools is a problem

  9. Dictionary validation • Semantic validation is the responsibility of the Validation Team • Syntactic validation must be performed against the EXPRESS model in IEC 61360-2 • Tools (parsers) exist for this purpose • Currently, tools that will parse a dictionary operate on SPF files only • Different parsers give different results • Can a dictionary in any other format than SPF be said to comply with the model?

  10. Demonstrations • Export of IEC dictionary data • Conversion of downloaded IEC dictionary to SPF, XML and Tagged formats • EXPRESSO parser • Proposed XML schema for dictionaries • Conversion of Tagged format to character-separated tables (for input to IEC database) • Input templates for new class and DET definitions • Using existing definitions as a basis for new ones

  11. Thank you for your attention.Any questions?

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