Feedapi - get parent feed node cck field value while parsing

I'd like to use the value from a cck field in the parent feed node to append the guid.

For example: cck field in parent feed = abc / guid in xml file is 123 ==> when parsed I'd like the guid in the database to be abc-123.

How do I get the data from the cck field of the parent node? Performance consequence? I'm assuming this is done at the time of parsing (I'm using a custom parser).

currently the guid is as follows:

@ $normalized->items[$key]->options->guid = (string) $item->guid;

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