Where is the definition for letterbased sidc? about milsymbol HOT 2 CLOSED

Disclaimer: I'm not an author of milsymbol and only give information I THINK is true.

Letter/alpha (15-char) SIDCs are defined in APP6C or MIL-STD 2525C (or older).

I'm not too familiar with milsymbol extension mechanism, but I can imagine that is quite hard to invent new SIDCs since a SIDC carries quite some semantics. I guess introducing new coding schemes or (battle) dimensions will lead nowhere, because they are simply not handled. But I can be wrong about this. Messing with existing coding schemes/dimension may produce unexpected results, since ranges of function ids are tested for specific meanings or requirements for different styling.

Introducing new Echelon will most probably not work. Even though only '-A' (team) up to '-N' (command) are taken, the SVG draw instructions are hard coded and cannot be extended.

Saying that, I'm currently playing with the idea to rewrite milsymbol to easily provide the possibility to add/register new symology standards only from (static) configuration files. Our software has quite some demand for additional/different 1-point symbols. I have some basic code working, but completely migrating APP6 C/D and 2525 B/C/D from milsymbol would be pretty demanding (but probably possible.)

from milsymbol.

You can find the letter based SIDC specification here, just download MIL-STD-2525C:

http://everyspec.com/MIL-STD/MIL-STD-2000-2999/MIL-STD-2525C_20429/

You can also find all the information extracted here:

https://github.com/spatialillusions/mil-std-2525

And for APP6 you can find the extracted information here:

https://github.com/spatialillusions/stanag-app6

When it comes to extending milsymbol, it is built very modular, and almost everything can be changed or updated. I once made a sample here: (Yes it is possible to add and change icon parts.)

https://twitter.com/spatialillusion/status/939891636951240704?s=61&t=PuGpHMa1duQrcvAxl6r5yg

from milsymbol.