What do the post_parsed table fields mean?

[minboost]

Hi,

I'm trying to create a function that inserts automatically to the post_parsed table (vBulletin 3.5.x) important posts when the cache is cleared. But I didn't get what the fields: styleid_code, styleid_html, styleid_php, styleid_quote mean, and what is the connection between them and the other tables.

I found in some forums that they have styleid_php and styleid_quote values different from -1. Are these fields foreign key from what table?

Thanks