improve representation of Work types

[VladimirAlexiev]

Consider https://api.openalex.org/works/W4327890772 vs https://semopenalex.org/work/W4327890772

• OpenAlex JSON has type: "article" and type_crossref: "proceedings-article"
• SemOpenAlex has only crossrefType "https://api.crossref.org/types/proceedings" ("type" is missing). But that is different (whole proceedings vs one article).
• https://api.crossref.org/types/proceedings and https://api.crossref.org/types/proceedings-article do resolve, but don't return much info.
  • In contrast, https://api.openalex.org/works?filter=type:article and https://api.openalex.org/works?filter=type:proceedings-article return all works of that type (with pagination).
  • (IMHO the second URL is wrong because it returns only 355 and it's a CrossRef value not an OpenAlex value)
• I think you should emit type and crossrefType as simple strings, and if you like to expose the above openalex filter URLs, you can form such URLs at the UI

[linnaung]

We will amend the mapping and include these in the next data generation.