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    <p>A delimiter denotes the limits of something, where it starts and where it ends. For example:</p> <pre><code>"this is a string" </code></pre> <p>has two delimiters, both of which happen to be the double-quote character. The delimiters indicate what's part of the thing, and what is not.</p> <p>A separator distinguishes two things in a sequence:</p> <pre><code>one, two 1\t2 code(); // comment </code></pre> <p>The role of a separator is to demarcate two distinct entities so that they can be distinguished. (Note that I say "two" because in computer science we're generally talking about processing a linear sequence of characters).</p> <p>A terminator indicates the end of a sequence. In a CSV, you could think of the newline as terminating the record on one line, or as separating one record from the next.</p> <p>Token boundaries are often denoted by a change in syntax classes:</p> <pre><code>foo() </code></pre> <p>would likely be tokenised as <code>word(foo)</code>, <code>lparen</code>, <code>rparen</code> - there aren't any explicit delimiters between the tokens, but a tokenizer would recognise the change in grammar classes between alpha and punctuation characters.</p> <p>The categories aren't completely distinct. For example:</p> <pre><code>[red, green, blue] </code></pre> <p>could (depending on your syntax) be a list of three items; the brackets delimit the list and the right-bracket terminates the list and marks the end of the <code>blue</code> token.</p> <p>As for SO's use of those terms as tags, they're just that: tags to indicate the topic of a question. There isn't a single unified controlled vocabulary for tags; anyone with enough karma can add a new tag. Enough differences in terminology exist that you could never have a single controlled tag vocabulary across all of the topics that SO covers.</p>
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