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Add support for detecting invalid XML that has unsupported content before root element #184

Merged

kou merged 1 commit into ruby:master from naitoh:fix_content_at_the_start_of_the_document

Jul 22, 2024

Commits on Jul 22, 2024

fix: Content at the start of the document

## Why?

XML with content at the start of the document is invalid.

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? '?>'
```

https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-Misc

```
[27]   	Misc	   ::=   	Comment | PI | S
```

https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-PI

```
[16]   	PI	   ::=   	'<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
```

https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-PITarget

```
[17]   	PITarget	   ::=   	Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))
```

https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-doctypedecl
```
[28]   	doctypedecl	   ::=   	'<!DOCTYPE' S Name (S ExternalID)? S? ('[' intSubset ']' S?)? '>'
```

naitoh committed Jul 22, 2024