Viewing github.com/alecthomas/chroma/lexers/embedded/bnf.xml

```
<lexer>
```
```
  <config>
```
```
    <name>BNF</name>
```
```
    <alias>bnf</alias>
```
```
    <filename>*.bnf</filename>
```
```
    <mime_type>text/x-bnf</mime_type>
```
```
  </config>
```
```
  <rules>
```
```
    <state name="root">
```

      <rule pattern="(&lt;)([ -;=?-~]+)(&gt;)">

```
        <bygroups>
```
```
          <token type="Punctuation"/>
```
```
          <token type="NameClass"/>
```
```
          <token type="Punctuation"/>
```
```
        </bygroups>
```
```
      </rule>
```
```
      <rule pattern="::=">
```
```
        <token type="Operator"/>
```
```
      </rule>
```
```
      <rule pattern="[^&lt;&gt;:]+">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
      <rule pattern=".">
```
```
        <token type="Text"/>
```
```
      </rule>
```
```
    </state>
```
```
  </rules>
```
```
</lexer>
```

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