SGML came out of document authoring and publishing. SGML is more suited for this domain because (among other things) you don't have to quote every single string

SGML came out of document authoring and publishing. SGML is more suited for this domain because (among other things) you don't have to quote every single string. It is not like the SGML community didn't know about s-expressions - DSSSL the style language for SGML was based on scheme, so they recognized s-expressions were appropriate for some domains.