[x3d-public] Stylesheet X3DUOM to JSON Schema

[John Carlson]

I have noticed that oneOf JSON schema properties are empty arrays.  I'm
guessing that this isn't feasible, and if we're going to construct a
stylesheet using AI, we're going to have to make a bunch of small mappings,
which is what Don requested originally.

That has been done, but there might have been some changes.  I will refresh
the mapping.

John

On Sun, Jan 25, 2026 at 6:14 AM John Carlson <yottzumm at gmail.com> wrote:

> Okay. I have a "schema" which is JSON, but I've not confirmed that it
> passes JSON meta-schema:
>
> https://github.com/coderextreme/X3DJSONLD/blob/master/src/specifications/X3dUnifiedObjectModel-4.1.json
>
> (sorry, bad name, please rename if you download it.  I will need to make
> modifications to my Java code in order to change the base name).
>
> I have also not confirmed if it validates any "X3D" JSON.  That is next.
>
> The modified XSLT which generates the schema from X3DUOM (imperfectly) is
> here:
>
> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/xslt/generateJSONschema2020-12.xslt
> I have gone into the schema and made edits, because I can't figure out the
> logic to or not to put a comma after the default value in JSON Schema.  The
> logic involved is here:
>
>
> https://github.com/coderextreme/X3DJSONLD/blob/23a53eb9f8835632fcad0a55087c86f284271fbb/src/main/xslt/generateJSONschema2020-12.xslt#L328
>
> Copied below:
>    <xsl:if test="
>              not($fieldName = 'language' and local-name() =
> 'PackagedShader' and not(@default)) and
>              not($fieldName = 'language' and local-name() =
> 'ProgramShader'  and not(@default)) and
>              not($fieldName = 'language' and local-name() =
> 'X3DShaderNode'  and not(@default)) and
>              not($fieldName = 'name'     and local-name() = 'meta'
>   and not(@default)) and
>              not($fieldName = 'name'     and local-name() =
> 'HAnimDisplacer' and not(@default)) and
>              not($fieldName = 'name'     and local-name() = 'HAnimJoint'
>   and not(@default)) and
>              not($fieldName = 'name'     and local-name() = 'HAnimSegment'
>   and not(@default)) and
>              not($fieldName = 'name'     and local-name() = 'HAnimSite'
>    and not(@default)) and
> (
> $fieldType = 'SFColor' or
> $fieldType = 'SFColorRGBA' or
> $fieldType = 'SFDouble' or
> $fieldType = 'SFFloat' or
> $fieldType = 'SFImage' or
> $fieldType = 'SFInt32' or
> $fieldType = 'SFMatrix3f' or
> $fieldType = 'SFMatrix4f' or
> $fieldType = 'SFRotation' or
> $fieldType = 'SFTime' or
> $fieldType = 'SFVec2f' or
> $fieldType = 'SFVec3d' or
> $fieldType = 'SFVec3f' or
> $fieldType = 'SFVec4f' or
> @default = 'NULL' or
> @default = '-1' or
> @default = '0' or
> @default = '1' or
> @default = '2.0' or
> @default = '3' or
> @default = '4.0' or
> @default = 'false' or
> @default = 'true' or
> @default = 'AUTO' or
> @default = 'BASIC' or
> @default = 'CONSTANT' or
> @default = 'FASTEST' or
> @default = 'Full' or
> @default = 'INVERSE' or
> @default = 'LINEAR' or
> @default = 'LOWPASS' or
> @default = 'MATCH_ANY' or
> @default = 'MAX' or
> @default = 'NONE' or
> @default = 'PIE' or
> @default = 'PLAIN' or
> @default = 'REPEAT' or
> @default = 'SPEAKERS' or
> @default = 'SPHERE' or
> @default = 'SQUARE' or
> @default = 'localhost' or
> @default = 'standAlone' or
> (@default != 'BOUNDS' and @default != 'CLOSEST' and not(@default)))">
>    <xsl:text>,
</xsl:text>
>
> Frankly, I am puzzled.  The problem involves absent default values for
> meta name, shader language and HAnim name fields.
>
> If someone wants to help with my logic, great.
>
> I created a shell script to run the stylesheet, here:
>
>
> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/shell/schema.sh
>
> The stylesheet should work with any XSLT 2.0 processor.
>
> Note that this schema varies wildly from the one generated by python.  I'm
> not quite sure why Claude.ai borked.  It was a one shot deal.  What I can
> do is try with X3DUOM, the Python XSLT generator, and a real JSON schema
> next (lots of tokens).
>
> John
>
> On Sun, Jan 25, 2026 at 1:27 AM John Carlson <yottzumm at gmail.com> wrote:
>
>> First cut at an XSLT stylesheet for converting X3DUOM to JSON schema.
>>
>> It’s got a web3d license.
>>
>> I’ve not tried it at all, that takes more work!  It’s 3/7th’s the size of
>> the python, so that’s impressive!
>>
>>
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