DRL: a property name that starts with an non-ASCII letter that can be capitized (such as a French or Russian property name) does not work.

public class I18nPerson implements Serializable {
    
    private String garçon; // "boy" in French
    private String élève; // "student" in French (creates a weird getter/setter name)
    private String имя; // "name" in Russian

    public String getGarçon() {
        return garçon;
    }

    public String getÉlève() {
        return élève;
    }

    public String getИмя() {
        return имя;
    }

}

rule "Use garçon property"
    salience 10
    when
        p : I18nPerson( garçon != null )
    then
        list.add( "garçon" );
end

rule "Use élève property"
    salience 10
    when
        p : I18nPerson( élève != null )
    then
        list.add( "éléve" );
end

rule "Use имя property"
    salience 10
    when
        p : I18nPerson( имя != null )
    then
        list.add( "имя" );
end

java.lang.AssertionError: Unable to Analyse Expression élève != null:
[Error: no such identifier: élève]
[Near : {... élève != null ....}]
             ^ : [Rule name='Use élève property']

Unable to Analyse Expression имя != null:
[Error: no such identifier: имя]
[Near : {... имя != null ....}]
             ^ : [Rule name='Use имя property']