[x3d-public] improved definitions for metadata

Brutzman, Donald (Don) (CIV) brutzman at nps.edu
Thu Aug 12 17:28:49 PDT 2021

Thanks for looking at this.

Please be advised that the spec changes in Mantis issue 1361 do not affect any existing functionality or child-content models, they are simply clarifications.

More on Metadata nodes can be found in the "unpublished" chapter in book X3D for Web Authors (X3D4WA).

  *   https://x3dgraphics.com/examples/X3dForWebAuthors/Chapter15Metadata/index.html
  *   https://x3dgraphics.com/examples/X3dForWebAuthors/Chapter15Metadata/Chapter15MetadataInformation.html

Any X3D node can contain a Metadata* node, including the Metadata* nodes themselves.  So, yes a MetadataFloat can contain a MetadataSet - if the set has a lot of information amplifying that particular float.  More common however is a MetadataSet containing multiple MetadataFloat, MetadataInteger, etc. nodes.

  *   https://www.web3d.org/x3d/content/X3dTooltips.html#MetadataFloat
  *   https://www.web3d.org/x3d/content/X3dTooltips.html#MetadataSet

From: John Carlson <yottzumm at gmail.com>
Sent: Tuesday, August 10, 2021 12:01 PM
To: Brutzman, Donald (Don) (CIV) <brutzman at nps.edu>
Cc: x3d-public at web3d.org
Subject: Re: [x3d-public] improved definitions for metadata

I will have to see how /metadata/ field is rendered in XML or JSON to provide adequate feedback.   I understand the use of /metadata/ field for MetadataSet, but having /metadata/ field for Metadata* beyond MetadataSet doesn't make sense to me.  It would make sense if Metadata* inherits from MetadataSet, but they don't.   In other words, a MetadataFloat containing a MetadataSet looks valid???

I will have to dig more into the standards other sections to give informed feedback.

On Tue, Aug 10, 2021 at 1:28 PM Brutzman, Donald (Don) (CIV) <brutzman at nps.edu<mailto:brutzman at nps.edu>> wrote:
Dick and I applied changes for Mantis 1361 to make terminology for Metadata* nodes more precise.

  *   Mantis 1361: 7.3.5 X3DNode /metadata/ field description and clarification for each Metadata* node
  *   https://www.web3d.org/member-only/mantis/view.php?id=1361

  *   https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/core.html#X3DNode

7.3.5 X3DNode
7.4.1 MetadataBoolean
7.4.2 MetadataDouble
7.4.3 MetadataFloat
7.4.4 MetadataInteger
7.4.5 MetadataSet
7.4.6 MetadataString

All review welcome, thanks.

all the best, Don
Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu<mailto:brutzman at nps.edu>
Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman

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