identify items that need to be imported for zbMath and set up import

[LizzAlice]

Fields returned by ZBMath query:

• ZBMath id --> document id --> zbmath_id.split(":")[-1]
• author --> P50 --> author.split("|"); got mapping to orcid; will be included into the api at a later time (within zbmath: match by author_id)
• author id --> zbMath author id P1556 --> author_ids.split("|")
• document title --> title: P1476
• source --> e.g. journal name --> published in P1433
  - edition: b = item.split(",")[0].split(" ")[-1] \n if b.isdigit()...
  - page numbers: item.split("|")[0].split(",")[-1].strip().split(" ")[0]
  (- year (slightly long): re.search('(([^)]+)',item.split("|")[0].split(",")[-1].strip().split(" ")[-1]).group(1))
• classifications --> Mathematics Subject Classification ID P3285 (?) --> classifications.split("|")
• language --> language of work or name P407
• links --> url P2699
• keywords -> just use strings --> or would it be better to make items for them?
• doi --> DOI P356
• publication year --> 'P577': 'publication date'
• serial --> journal name: item.split("|")[0] ; publisher: item.split("|")[1].split(",")[0]