The SQL repository query system also lets you create a query against a parent item descriptor that returns items of a child item descriptor. For example, suppose you have the following item descriptors and properties:

You can then create queries like these, even though the products item descriptor does not include waterproofRating, size, or channelCount properties:

products whose waterproofRating is 'JIS-4'
products whose channelCount = 7
products whose waterproofRating is 'JIS-4' OR whose size > 7

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