# Functions

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IsEmptyVersionedData check if VersionedData is empty.
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NewXModelCache new an instance of XModel Cache.
ParseContractEvents parse contract events from tx.
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# Constants

BucketSeperator separator between bucket and raw key.
DelFlag delete flag.
TransientBucket is the name of bucket that only appears in tx output set but does't persists in xmodel.

# Variables

ErrHasDel is returned when key was marked as del.
ErrNotFound is returned when key is not found.

# Structs

ContractIterator 把contract.XMIterator转换成contract.Iterator.
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XMCache data structure for XModel Cache.

# Interfaces

UtxoReader manages utxos.