# XdSignatureRelation Enumeration

The XdSignatureRelation enumeration is used to determine how digital signatures can be added to a SignedDataBlock object. These enumerated values are read-only.

Name | Value | Description
--- | --- | ---
xdSignatureRelationCoSign | 2 | Specifies that signatures are independent of each other in the SignedDataBlock object.
xdSignatureRelationCounterSign | 3 | Specifies that each signature signs the preceding signature in the SignedDataBlock object.
xdSignatureRelationSingle | 1 | Specifies that only one signature can exist in the SignedDataBlock object.

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