 ETL (Extract, Transform, Load) work, domain-specific processing, and any scenario where you want to leverage Grapa's executable BNF system without affecting the core language.</p>
<h2 id="key-benefits">Key Benefits</h2>
<h3 id="1-no-side-effects"><strong>1. No Side Effects</strong></h3>
<ul>
<li><strong>Isolated Execution</strong>: Custom rules don't modify the main Grapa language</li>
<li><strong>Safe Processing</strong>: No risk of breaking existing scripts or functionality</li>
<li><strong>Clean Separat