Consider the XML I attached (tomcat manager status)
There are some connectors and corresponding items to them, which can be discovered.

If I save this XML value through an HTTP check item and then be able to make an LLD rule dependent on it, I can easily discover {#CONNECTOR}s and {#CONNECTOR_ITEM}s using current feature requests and link ZBXNEXT-4805 without making extra requests. This will drastically decrease load on both Zabbix server and hosts.

So this issue --> LLD rule dependant on item value

ZBXNET-4805 --> Item value dependant on LLD rule

can be very helpful.