Custom literals

[jmatsushita]

Hi there,

Thanks for the great project! I bumped into it while looking for implementations of algebraic property graphs 👍

I'm wondering if I'm correct that custom literals aren't parsed in the tasl DSL yet? This example from the docs https://tasl.io/docs/literals doesn't parse:

namespace ex http://example.com/
namespace xsd http://www.w3.org/2001/XMLSchema#

literal myCustomLiteralName ex:hello/world
literal integer xsd:integer

class ex:Thing {
  ex:foo -> myCustomLiteralName
  ex:bar -> integer
}

I get the following error:

  SyntaxError {
    message: 'No parse at 82',
  }

  › Parse.advance (file://node_modules/@lezer/lr/dist/index.js:1101:23)
  › LRParser.parse (file://node_modules/@lezer/common/dist/index.js:1272:30)
  › parseSchema (file://src/schema/parseSchema.ts:10:17)
  › file://test/schema.test.ts:104:17

Also maybe you can answer this question underlay/underlay.org#129 about underlay and tasl?

Thanks!

Jun