求Stanford Dependency Parser(3.9.1)依存标签含义的最新说明文档

If you're hunting for clear, up-to-date definitions of dependency labels like nmod, acl, and nmod:npmod used in Stanford Dependency Parser 3.9.1, here are the most reliable places to look:

• Official Stanford CoreNLP version-specific docs
  The standalone Stanford Dependency Manual might be outdated (like the 3.7.0 copy you found), but the CoreNLP documentation—which includes the dependency parser—stays aligned with parser releases. For 3.9.1, the dependency scheme section in the corresponding CoreNLP docs will have accurate label definitions.

• Included documentation in the parser package
  When you download the 3.9.1 parser archive, check the docs folder inside. It often contains READMEs or Javadoc files that detail the exact dependency labels used in that version. These are often more precise than older online manuals because they're bundled directly with the parser.

• Stanford Dependency Scheme reference pages
  The core dependency scheme definitions are maintained alongside CoreNLP updates. Even for 3.9.1, the scheme's main reference will cover labels like nmod and its subtypes (like nmod:npmod), as well as acl.

• 3.9.1 release notes
  Stanford typically calls out changes to dependency labels in their release notes. Checking these can clarify any new labels or modifications that weren't present in 3.7.0.

To save you some time, here's a quick breakdown of the labels you're curious about (per the 3.9.x scheme):

• nmod: Nominal modifier — a catch-all for nominal dependencies that don't fit more specific roles (like nouns modifying other nouns or verbs).
• acl: Adjectival clause modifier — a clausal (verbal) modifier that acts like an adjective to describe a noun (e.g., the posed clause modifying radiation in your parse output).
• nmod:npmod: Noun phrase modifier (a subtype of nmod) — used when a noun phrase functions as an adverbial modifier (like some forty years modifying earlier in your example).

内容的提问来源于stack exchange，提问作者Morphy Z