| http://www.w3.org/ns/prov#value | - The hierarchy comprises Level 1 assets and liabilities, which are measured using ???observable??? inputs, such as quoted prices in active markets; Level 2 inputs, which are based on observable information, such as quoted prices in similar markets; and Level 3 items, which are the most difficult to measure, as they are illiquid assets and liabilities that must be valued using internal models.
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