0

I wrote

Unlike a free-text document, which requires natural language processing techniques to extract information, extracting structured data from semi-structured web documents is easier as they use HTML tags to typeset small pieces of information in tables or lists.

Should it be "that requires" as a restrictive relative clause? Because I use it in the reason?

2

Your text as written is correct.

If you had written,

a free-text document that requires natural language processing techniques,

you would be saying, "So, some text-free documents require these techniques, and some don't. I'm talking only about the kind that does. Semi-structured web documents are not like that kind."

Instead, you've written,

a free-text document, which requires natural language processing techniques,

and are saying, "as you may know, text-free documents typically require special techniques for processing. Semi-structured web documents are different."

4

I'm pretty sure the relative clause should be non-restrictive.

As I understand it, under your definition extracting information from all free texts requires natural language processing, so you're not speaking of a restricted set of free-text documents; you're adding information which is true of any free-text document.

  • Yes, my sentence is not that valid, I could say "Unlike a free-text document, which requires advanced techniques like natural language processing, ......" – Ahmad Sep 3 '15 at 17:17
  • However currently I just wrote the idea as * A web page is commonly referred to as a semi-structured data source, in contrast with a plain text, which is mainly regarded as an unstructured data source. A semi-structured web document uses HTML tags to typeset small pieces of information in tables or lists. Therefore, extracting structured data from this type of document is easier.* – Ahmad Sep 3 '15 at 17:17
  • 1
    @Ahmad You could write something like "Unlike free-text documents, whose analysis depends on close attention to complex and often ambiguous orthographic and linguistic clues, . . ." – StoneyB Sep 3 '15 at 17:24

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.