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Add position check for XML declaration #162

Merged
merged 1 commit into from
Jul 7, 2024
Merged

Add position check for XML declaration #162

merged 1 commit into from
Jul 7, 2024

Commits on Jul 7, 2024

  1. Add position check for XML declaration 

    ## 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)
    @naitoh
    naitoh committed Jul 7, 2024
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