Standards in Flux Norman Walsh MarkLogic Corporation 14 Feb 2011

Transcription

1 Standards in Flux Norman Walsh MarkLogic Corporation 14 Feb 2011

2 Norman Walsh Lead Engineer in Application Services Formerly Principal Technologist in Media Slide 1

3 Standards organizations W3C Chair XML Processing Model, HTML/XML Task Force, co-chair XML Core, member XSLT. Former member of XQuery, XML Schema, TAG. OASIS Chair DocBook, member RELAX NG. Former member of Entity Resolution. Also IETF, ISO, IDPF, TEI, IDEAlliance, NCBI/NLM, WHATWG, etc. Slide 2

4 Big Picture One big happy family. Mostly. Slide 3

5 epub Big Picture Where epub fits in. Mostly. Slide 4

6 XML W3C Core specs XML Schema 1.1 XPath, XQuery, XSLT, et. al., 3.0 (Did he say 3.0?) OASIS and lots of other places Language vocabularies (mostly) DocBook, DITA, TEI, NLM, Slide 5

7 XML Schema 1.1 Extensibility/wildcard enhancements (open content, weak wildcards) Co-occurrence constraints (assertions, conditional type assignment) Multiple substitution group heads Relaxed restrictions on xsd:all Schema composition improvements Slide 6

8 XPath 3.0 Literal function items and dynamic function invocation let expressions Support for literal URIs in expanded QNames Support for XML Schema 1.1 Slide 7

9 XQuery 3.0 Grouping and windowing Try/catch expressions Computed namespace constructors Output declarations Slide 8

10 XSLT 3.0 (er, mostly) Focus on streaming xsl:iterate, xsl:stream, xsl:fork, xsl:merge Other language enhancements xsl:context-item, xsl:evaluate, xsl:try/xsl:catch, xsl:mode, innermost andoutermost functions Patterns can now match any item (not just nodes) Speculative features: maps, arrays, JSON support Slide 9

11 XProc: An XML Pipeline Language Mostly declarative language for describing a set of operations: Validate, XInclude, then Transform Validate, XInclude, Validate, then Transform Request data from a web service, combine with local data, cleanup attributes, fix namespaces, store locally Grouping, conditional evaluation, exception handling, iteration, and a vocabulary of more than forty steps Extensible and composable Slide 10

12 DocBook DocBook V5.0 is an OASIS Standard Publishers Schema is a Committee Specification DocBook V5.1 plans improved support for topic-based authoring (topics and assemblies) Slide 11

13 HTML + CSS Interoperability, interoperability, & interoperability HTML CSS Firefox (and Gecko-based), Chrome (and WebKit based), Opera, IE(7/8/9+) New features: multimedia and graphics, more structure, better forms, simpler markup New features: more powerful selectors, more pseudo-classes, more text effects, media queries, paged media, mult-column layouts, generated content, ruby annotations Did I mention interoperability? Slide 12

14 HTML Markup Structural elements: article, section, header/footer, nav, Block elements: figure, aside, Inlines: progress, meter, time, ruby, Multimedia and graphics: video, audio, canvas Input types: tel, url, date, datetime, datetime-local, range, number, color, Slide 13

15 HTML APIs Multimedia (audio and video) Editing and Drag & Drop History Offline applications Protocol and media-type registration Slide 14

16 CSS CSS 3 is composed of many modules More powerful selectors, more pseudo-classes, text-effects Media queries Paged media, multi-column layouts Web fonts Generated content Slide 15

17 What about HTML + XML? W3C Technical Architecture Group HTML-XML Task Force Slide 16

18 HTML + XML Use Cases Using an XML toolchain to consume HTML Using an HTML toolchain to consume XML Islands of HTML in XML Islands of XML in HTML Simpler, more-forgiving XML Using an XML toolchain to produce HTML Slide 17

19 HTML + XML Use Cases Using any of the mechanisms just described or, Just use the XHTML serialization of HTML This is what EPUB does Increasingly, a practical alternative now that IE supports XHTML Slide 18

20 Video The video element simplifies video markup Codec issues ongoing (MPEG-4/H.264, MP4, ) Slide 19

21 Audio The audio element simplifies video markup Codec issues seem better resolved (MP3 or AAC) Slide 20

22 <closing>thank you!</closing> Slide 21