Blanks, horizontal and vertical tabs, carriage returns, formfeeds, and newlines, collectively called white space, are ignored except as they serve to separate tokens. Newlines are special in that they cannot appear in some contexts where other whitespace can appear, and are also used to end C++-style comments (see section 4.2 Comments).
white-space ::= non-nl-white-space | newline non-nl-white-space ::= a blank, tab, vertical tab, carriage return, or formfeed character newline ::= a newline character
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