Add position check for XML declaration #162
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kou
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Jul 6, 2024
## Why? XML declaration must be the first item. https://www.w3.org/TR/2006/REC-xml11-20060816/#document ``` [1] document ::= ( prolog element Misc* ) - ( Char* RestrictedChar Char* ) ``` https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-prolog ``` [22] prolog ::= XMLDecl Misc* (doctypedecl Misc*)? ``` https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-XMLDecl ``` [23] XMLDecl ::= '<?xml' VersionInfo EncodingDecl? SDDecl? S? '?>' ``` See: ruby#161 (comment)
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Why?
XML declaration must be the first item.
https://www.w3.org/TR/2006/REC-xml11-20060816/#document
https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-prolog
https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-XMLDecl
See: #161 (comment)