1. A method of storing descriptive metatag-value pairs for parametized information regarding first and second items having differing classifications, comprising: providing a first electronic interface through which a first human user identifies the first item in a first document to a computer system; prompting the first user to select a first classification for the first item, wherein the first user selects the first classification for the first item; providing the first user with a first set of metatag choices determined at least in part by the first user's selection of the first classification; presenting the first user with: (a) the first set of metatag choices for possible association with the first item, and (b) candidate values for at least one of the metatag choices that allows the first user to define a first metatag-value pair; providing a second electronic interface through which the first user creates a new metatag for the first set of metatag choices which based on an analysis of a second document that includes the second item, is subsequently displayed in the first set of metatag choices to a second human user for the second user to utilize in entering a second metatag-value pair for possible association with the second item in the second document; and storing an association of the first item and the new metatag in a data structure.