<?xml version="1.0" ?> <a text="b&c"/>
当我使用W3School’s validator，我得到错误：
EntityRef: expecting ‘
;‘
The ampersand character (&) and the left angle bracket (<) MUST NOT appear in their literal form,except when used as markup delimiters,or within a comment,a processing instruction,or a CDATA section.
If they are needed elsewhere,they MUST be escaped using either numeric character references or the strings ”
&
” and ”
<
” respectively. The right angle bracket (>) may be represented using the string ”
>
“,and MUST,for compatibility,be escaped using either ”
>
” or a character reference when it appears in the string ”
]]>” in content,when that string is not marking the end of a CDATA section.
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