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API Birds of a Feather, XML

API Birds of a Feather, XML. Robert C. Leif, Ph.D. Vice President R &D, Newport Instruments & Ada_Med Tel. (619)582-0437 Email rleif@rleif.com Web: www.newportinstruments.com. How do we work together on APIs?.

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API Birds of a Feather, XML

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  1. API Birds of a Feather, XML • Robert C. Leif, Ph.D. • Vice President R &D, Newport Instruments & Ada_Med • Tel. (619)582-0437 • Email rleif@rleif.com • Web: www.newportinstruments.com

  2. How do we work together on APIs? • Commercial developers should provide sources and there should be no cost for single and educational uses. • ADA DEVELOPERS COOPERATIVE LICENSE, www.newportinstruments.com • Software Developers Cooperative, http://www.softdevelcoop.org/ • http://groups.yahoo.com/group/softdevelcoop/ • GNU licenses include: Other forms of licensing will be considered.

  3. Which Standard(s)?Requirements • Sources and materials available for free • On the web • No hidden patents or unreasonable royalties. • Operating system independent. • Must support: Windows, Linux, and Macintosh • Reasonable design • Standard’s parsimony • Create new by reusing old standards.

  4. World Wide Web Consortium (W3C)http://www.w3.org/ • Only reasonable choice • XML eXtensible Markup Language • Schema Data-Types • SVG Scalable Vector Graphics • XForms: Forms for the Web • XSL:fo Formatting language • SOAP Simple Object Access Protocol

  5. The Browser will be the GUI • Eliminates duplicate application programming interfaces for the operating system and the web. • Provides portability between operating systems. • Open to all. • Excellent opportunity for Ada!

  6. W3C Compound Document Formats= Ada program output • Combine multiple formats: • XHTML for hypertext • Extensible HyperText Markup Language • SVG for graphics • Scalable Vector Graphics • SMIL • Synchronized Multimedia Integration Language • XForms for forms on the web

  7. XML Schema • Ada button: “In Strong Typing We Trust” • Best argument for schema vs. DTD. • XML schema can and should have Ada semantics. • Need tools for bidirectional translation of data-types. • Goal: XML_Io. • Provides strongly typed output from Ada programs. • Facilitates development of applications that include XML data. • Permits the use of W3C Designs • Ada and Web modes

  8. Numbers • Create the same numeric types for both. • Ecumenical approach use ECMA types. • http://www.ecma.ch/ • Originally, European Computer Manufacturers Association • Now, ECMA International - European association for standardizing information and communication systems.

  9. Real Types are Primitive

  10. Integer Types are Derived *Derived Fromdecimal;fractionDigits·= 0

  11. XML 32 bit Integer Equivalent <simpleType name="Int32_Type"> <restriction base="int"> <minInclusive value="-2147483648"/> <maxInclusive value="2147483647"/> </restriction> </simpleType>

  12. Create Unicode Strings by Addition of fields to Bounded_String • Encapsulated in generic packages, Ada.Strings.Bounded. & Wide_Bounded • Solution: • Create a generic that instantiates Ada.Strings. Wide_Bounded with a generic type. • Add a Character_Set_Type etc. to a private tagged type. • Add a Modified version of all of the methods in Ada.Strings.Wide_Bounded • Instantiate (Character_Set => Utf16)

  13. XForms 1.0W3C Recommendation 14 October 2003 • XForms: model, instance data, and user interface • Separates presentation from content • Benefits: reuse, strong typing, reduction of round-trips to the server, device independence, and a reduces the need for scripting. • XForms • Not a free-standing document type • Integrated into XHTML or SVG. • Examples from http://www.formsplayer.com/

  14. Ada GUI based on SVG & XForms • Could be based on either CLAW or GNAVI • Need thick binding for operating system independence • Standard Ada implementation based on SVG data-types produces output to be executed by operating system or • outputs SVG • XForms can primarily be an SVG application

  15. SOAP • Interface SOAP with the Ada Distributed Systems Annex And/or • CORBA replace IDL with XML?

  16. Odds & Ends • A complete description of Ada in XML schema would permit the use of an XML based word processor as a program editor. • The design documentation and the source could be connected by hypertext links. • To begin this,I Translated Thomas Wolf’sAdaBrowse Document Type Definition (DTD) into a Schema.

  17. Conclusions & Bottom Line • Make the Ada and XML schema data-types the same. • Treat the XML presentation tools as a new very important API for a user interface standard. • Base new Ada API designs on XML standards. • Combine SOAP with the Ada Distributed Systems Annex and/or CORBA

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