semantics

问题 There are lots of people out there asking "why shouldn't we use tables for structuring our HTML" and while a lot of answers come in, I rarely see anyone being converted to the world of semantics. That said, I've yet to see any convincing rebuttals to support the rationale for why we should (or might) use tables. Anyone care to offer a rationale for when tables are valid structural markup? Nov 7, 2008 Considering that this question didn't go away like I thought it would, I suppose I'd better

问题 What to use for poem? pre blockquote code something else? 回答1: Don't use code (unless computer code is part of the poem). Don't use blockquote (unless you quote a poem). white space / line breaks: pre or br You may use the pre element. The spec gives an (informative) example: The following shows a contemporary poem that uses the pre element to preserve its unusual formatting, which forms an intrinsic part of the poem itself. <pre> maxling it is with a heart heavy that i admit loss of a feline

问题 I've often wondered about the proper use of a <br> line break. Seems that often they are incorrectly used for positioning or clearing content where CSS should instead be used. W3schoools.org says to use <br> for blank lines, but not for creating or separating paragraphs. Looking over W3C HTML5 spec draft, it's a little clearer that the <br> would be used when content requires a line break such as lines of an address or blank lines in poetry, where intended by the author. But I'm still

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I'm trying to find some good examples of semantic diff/merge utilities. The traditional paradigm of comparing source code files works by comparing lines and characters.. but are there any utilities out there (for any language) that actually consider the structure of code when comparing files? For example,

问题 I know that for a list, partial matching is done when indexing using the basic operators $ and [[ . For example: ll <- list(yy=1) ll$y [1] 1 But I am still an R newbie and this is new for me, partial matching of function arguments: h <- function(xx=2)xx h(x=2) [1] 2 I want to understand how this works. What is the mechanism behind it? Does this have any side effects? I want understand how can someone test if the xx argument was given? Edit after Andrie comment: Internally R uses pmatch

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . Locked . This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. What makes a language a scripting language? I've heard some people say "when it gets interpreted

问题 Given an HTML page that is a text heavy article, I would like to identify and parse out the primary content. Using http://www.fivethirtyeight.com/2009/08/chavismo-obama-and-monroe-doctrine.html as an example, I want to identify div#post-4438372351887392855, which contains the title and article. I know nothing can be perfect or work 100% of the time, but is there an approach that can give me the desired result in a reasonable number of circumstances? My present thought is to iterate through

问题 This is a question about correctly "naming things". Specifically, how do you distinguish between: the "between" table in a many-to-many relationship (e.g. users , users_questions , questions ) the (temporary) table that is created during a SQL JOIN (e.g. 'SELECT * FROM users INNER JOIN users_questions.user_id ON users.id WHERE users_question.question_id=37016694;`) 回答1: Lots of database designers use the term join table in your first sense: to implement a many-to-many relationship between

问题 I am searching for a set of semantic web services to test my work. Does anybody know a public web services search engine, or any web services repository in which web services are semantically described (e.g., using OWL-S)? 回答1: Check out these resources OWL for Services (OWL-S) - Examples Collection of OWL-S Web Services 来源： https://stackoverflow.com/questions/17393071/semantic-web-services-search-engine

问题 RFC 2616 Section 14.29 says that if the last modified date is in the future , it should be replaced with the message origination date: An origin server MUST NOT send a Last-Modified date which is later than the server's time of message origination. In such cases, where the resource's last modification would indicate some time in the future , the server MUST replace that date with the message origination date. The RFC doesn't elaborate any furthur on last modification dates that would indicate