class ProductHelper {

	public getAllAttributeValues(Product product): array
	{ return ['attribute1' => 'value1', 'attribute2' => ['tag1', 'tag2'], ...}

	getOptionalAttributeValues(Product product): array //why?
	{ return ['key' => ['value',..], ...] }

	public getAttributeValueScalar(Product product, String attributeName, String delimiter): string
	{
return  'tag1, tag2'; //or
return 'value';
}
	public getAttributeValueArray(Product product, String attributeName): array
	{
return  ['tag1', 'tag2']; //or
return ['value'];
}

	getOneOptionalAttribute(Product product) //why?
	{ return ['key' => ['value',..]] }

	public getAnyAttribute(Product product, array attributes) //is there a use case?
	{ return ['key' => value, ...] }

	getAnyOptionalAttribute(Product product, array attributes) //why?
	{ return ['key' => ['value',..], ...] }

	getOptinalAttributeAsString(Product product, String delimiter) //see above
	{ return attribute . delimeter . ... }

}