From MWCSWiki

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Types of conflict

Single-valued fields:

• A and B disagree about a 1-cardinality field value.
  • B gives a different value than A.
  • B just disagrees with A's value (without providing an alternative.)
• violates open-world assumption: <strike>B disagrees that the field even has a value for A's field.</strike>
• schema: <strike>B disagrees that A's field even exists for that role.</strike>

Multi-valued fields:

• B objects to an A field value.

View states with respect to a conflict

Simple case: with respect to only two conflicting values:

1. You have never chosen between conflicting values.
2. You have chosen a value before another (conflicting) value came into existence.
3. You have chosen between two conflicting values.

General case: with respect to n conflicting values:

1. You have never chosen between (any of the) conflicting values.
2. You have chosen a value before some of the other values have come into existence.
3. You have chosen between all known values.