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X3D Example Archives: X3D for Web Authors, Chapter 15 Metadata

Metadata (book with question mark)

Metadata is used to identify the data relevant to X3D scenes and shapes, enabling the possibility of further correlation, discovery and Web-based mashups to occur.

Metadata is about forms of data relating to other data. For example, metadata can provide a variety of information regarding a document such as author, date revised, relevant key words, etc. As another example, metadata might annotate X3D CAD geometry to provide key references such as part numbers, documentation references, inventory links, etc.

Simple name=value paired information can be provided in document <head> and <meta> tags, just like in HTML. Furthermore, typed metadata information can annotate any X3D node, either for use offline or for queries within an active scene graph at run time. Persistent X3D metadata nodes include MetadataBoolean, MetadataDouble, MetadataFloat, MetadataInteger, MetadataString, and MetadataSet (a set holder which contains a collection of other X3D Metadata nodes).

WorldInfo nodes are also persistent and retained after loading at run time, containing a scene title and other free-form information. Comments might also contain useful information but typically are not required to be retained when files are loaded or converted.

The supporting Chapter 15 Metadata Information from X3D for Web Authors is available online via X3dGraphics.com. Also available:

Library card catalogs provide metadata
  2 X3D Scenes       Scene Descriptions
MetadataNodeExamples Metadata Node Examples Simple examples of meta statements, comments, WorldInfo node and typed metadata nodes.
WorldInfo World Info Simple examples of meta statements, comments, WorldInfo node and a MetadataString node.

Online at http://X3dGraphics.com/examples/X3dForWebAuthors/Chapter15Metadata

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Master source-code model archive is under subversion control at
http://sourceforge.net/p/x3d/code/HEAD/tree/www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter15Metadata

The X3D Resources: Examples page and Savage Developers Guide provide more information about the production of this archive.

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