ABIE Signature Information. Details This class captures a single signature and optionally associates to a signature in the document with the corresponding identifier. Signature Information BBIE Signature Information. Identifier This specifies the identifier of the signature distinguishing it from other signatures. 0..1 Signature Information Identifier Identifier Identifier. Type BBIE Signature Information. Referenced Signature Identifier. Identifier This associates this signature with the identifier of a signature business object in the document. 0..1 Signature Information Referenced Signature Identifier Identifier Identifier. Type This is a single digital signature as defined by the W3C specification.