So, what IS the difference between AACR2, RDA, DDC, LC, FRBR, CCO and MARC? (and we're adding in ICP and CDWA-Lite)

Guidelines for Cataloging:

with structures such as:

Controlled Vocabulary

Establishment of Authority and subsets

Some form of linking data

Established Relationships between data

Widespread use across borders and fields of study

keywords:

is represented by:

CCO for art, music, museum-housed items

AACR2 for text, recorded materials, and sometimes realia

RDA, which is what AACR3 turned into

Dublin Core (metadata terms, not specific items)

ICP and

maybe

FRBR,(and FRANAR and FRASAD and ...) the rules for RDA

Guidelines for Shelving:

with structures such as:

numerical representation

alphabetical representation

divisions by subject, location, time period, other specifics

keywords:

is represented by:

DDC

LCC

Guidelines for Syncing Bibliographic Data with Electronic Resources:

with structures such as:

Binary or numerical representation of order and placement

Structured syntax

Proscribed punctuation 

keywords: metadata, framework, data sets, metadata element set, interoperability

is represented by:

MARC

CDWA-Lite (Categories for the Descriptions of Works of Art)

VRA Core XML

MODS (Metadata Object Description Schema)