1. A method including: receiving an aspect and a request from a user, the aspect being used to describe a data item and the request to solicit at least one candidate value to associate with the aspect; identifying a string of text in a database based on the aspect, the identifying the string of text including one or more actions selected from a group of actions consisting of identifying the aspect in the string of text, identifying a synonym of the aspect in the string of text, identifying an acronym of the aspect in the string of text, and identifying an alternate spelling of the aspect in the string of text, the database being a sample of data items from a first database that is utilized by a plurality of buyers and a plurality of sellers that utilize a network-based marketplace, the sample of data items including a seasonal sample; analyzing the string of text based on the aspect to identify at least one candidate value in the string of text, the at least one candidate value including a first candidate value; communicating the at least one candidate value to the user; receiving a rule including an aspect-value pair including the aspect and the first candidate value; publishing the rule in a production environment; associating the aspect-value pair to a first data item based on the published rule, the associating including concatenating the aspect-value pair to the first data item responsive to identifying the first candidate value in the first data item to generate the first data item including the concatenated aspect-value pair; receiving a first query; associating the aspect-value pair to the first query based on the rule; and identifying the first data item including the concatenated aspect-value pair for inclusion in an interface based on the associating the aspect-value pair to the first query based on the first rule; receiving a request to publish a dictionary for a particular domain in a preview environment in the network-based marketplace, the preview environment is being utilized to test a rule before the rule is applied to at least one of the first data item and the first query in a production environment, the dictionary including a plurality of domain rules being utilized to associate a first category on the network-based marketplace with a first product type, and the first category and the first product type further being associated with the first data item for sale on the network-based marketplace.