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RNGOM is an open-source Java library for parsing RELAX NG grammars.

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package org.kohsuke.rngom.digested;



/**
 * @author Kohsuke Kawaguchi ([email protected])
 */
public class DOptionalPattern extends DUnaryPattern {
    public boolean isNullable() {
        return true;
    }
    public Object accept( DPatternVisitor visitor ) {
        return visitor.onOptional(this);
    }
}