Online grammar test

Here you can try Visual BNF engine online.
For more information and to download desktop version go to www.intralogic.eu website.
Visual BNF engine by Intralogic (c) 2007, Adam Slosarski

1) Write first some grammar in BNF notation below (how?):

'Name'         = "XML";
'Version'      = "1.0";
'Author'       = "W3C Recommendation 10-February-1998";
'About'        = "eXtenable Markup Language";

'Entry' = "XMLDoc";

XMLDoc ::= "<?" Name Attributes "?>" Object;

Objects   ::= Object Objects
              | Object;

Object    ::= StartTag Content EndTag
              | UnaryTag;

StartTag ::= "<" Name Attributes ">";
EndTag   ::= "</" Name ">";

UnaryTag ::= "<" Name Attributes "/>";

Content   ::= Objects
              | Text
              | NULL;

Attributes ::=  Attribute Attributes               
               | NULL;

Attribute ::= Name "=" AttributeValue;

Text ::= Text Word
         | Word;

Word ::= Name
         | Symbol
         | "="
         | CharName
         | CharNumber;

{SymbolChars}     = {Printable} - {Letter} - ["<>'\"="] - {Whitespace};
{AttributeChars}  = {Printable} - ["\""];

//Comment Start = ""

AttributeValue =  "\"" {AttributeChars}* "\"";

Name    = {Letter}{Alphanumeric}*;
Symbol  = {SymbolChars};

CharName    = "&" {Letter}+ ";";
CharNumber  = "&#" {Digit}+ ";";

Here you can see warnings and errors of grammar definition:

2) Write here some text to parse by BNF notation written above:

Here you can see warnings and errors of tested grammar:

Here you can see generated parse tree: