linear white space是什么意思？

[简普塞]

linear white space是什么意思呢？
查阅了RFC-822中该词出现的上下文，原文如下：
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Each header field can be viewed as a single, logical line of ASCII characters, comprising a field-name and a field-body.
For convenience, the field-body portion of this conceptual entity can be split into a multiple-line representation; this
is called "folding". The general rule is that wherever there may be linear-white-space (NOT simply LWSP-chars), a CRLF
immediately followed by AT LEAST one LWSP-char may instead be inserted. Thus, the single line
To: "Joe & J. Harvey" <ddd @Org>, JJV @ BBN
can be represented as:

To: "Joe & J. Harvey" <ddd @ Org>,
JJV@BBN

and

To: "Joe & J. Harvey"
<ddd@ Org>, JJV
@BBN

and

To: "Joe &
J. Harvey" <ddd @ Org>, JJV @ BBN

The process of moving from this folded multiple-line representation of a header field to its single line representation is called "unfolding". Unfolding is accomplished by regarding CRLF immediately followed by a LWSP-char as equivalent to the
LWSP-char.
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所以这个词应该是 空白字符的意思 呵呵呵~

[赵4老师]

百度搜相关关键字。