For example, in English, abbreviations are traditionally identified using square brackets. That could mean a widget, a blog post or even a comment within a blog post.
Attribution for the quotation, may be be placed inside the blockquote element, but must be within a cite element for in-text attributions or within a footer element.
Content that needs extra context from its parent sectioning element to make sense. The figcaption element was not used, in this case, as a container for the citation as it is not a caption. Major site navigation that consistently appears frequently across the site.
This markup clearly defines where your major page content is contained. Please also consider also that there are other interesting HTML5 tags which are similar to section.
Content that is self-contained in that it makes sense on its own when taken out of context. The article element is used for each post, to mark up the threading.
Content that is only tangentially related or not related to the main content. The content of a blockquote may be abbreviated, may have context added or may have annotations. Think of something like a sidebar with supplementary information, a note within an article, or the outer container for a list of related articles at the bottom of a blog post.
We have a method, and that method helps us to reach not absolute truth, only asymptotic approaches to the truth — never there, just closer and closer, always finding vast new oceans of undiscovered possibilities.
Any such additions or changes to quoted text must be indicated in the text at the text level.