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Table 9 Top 15 W3C standards in terms of long development time

From: On organisational involvement and collaboration in W3C standards through editorship

  Time # org Standard Technology
#1 5801 2 RDF Schema 1.1 T4: RDF
#2 5382 3 CSS Namespaces Module Level 3 T10: CSS
#3 4963 5 Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification T10: CSS
#4 4772 1 PICS 1.1 Rating Services and Rating Systems -- and Their Machine Readable Descriptions T61: PICS
#5 4772 1 PICS 1.1 Label Distribution -- Label Syntax and Communication Protocols T61: PICS
#6 4761 4 CSS Style Attributes T2: HTML, T10: CSS
#7 4577 2 Authoring Tool Accessibility Guidelines (ATAG) 2.0 T16: Accessibility, T65: Authoring Tool Accessibility Guidelines (ATAG)
#8 4575 1 PICS Signed Labels (DSig) 1.0 Specification T61: PICS
#9 4555 3 RDF 1.1 XML Syntax T4: RDF
#10 4529 0a Cascading Style Sheets (CSS1) Level 1 Specification T10: CSS
#11 4440 5 Selectors Level 3 T10: CSS
#12 4410 3 Associating Style Sheets with XML documents 1.0 (Second Edition) T10: CSS, T72: Stylesheets in XML
#13 4395 5 Extensible Markup Language (XML) 1.0 (Fifth Edition) T20: XML
#14 4367 4 CSS Color Module Level 3 T10: CSS
#15 4355 1 PICSRules 1.1 Specification T61: PICS
  1. aNo organisation has been declared as editor for this standard