Contains an XPath expression that points to the XML Document Object Model (DOM) node in the form's underlying XML document that is used for storing the digital signature.
The following is an example of the signatureLocation attribute as it is used in the signedDataBlock element:
<xsf:documentSignatures>
<xsf:signedDataBlock name=”main”
data=”my:myfields/my:subtree1 | my:myfields/my:subtree2”
signatureLocation=”my:mifields/sig:signatures/main”
mode=”countersign”>
<xsf:message>By pressing the "Sign" button below, I agree to be bound
to the terms of this document.</xsf:message>
</xsf:signedDataBlock>
</xsf:documentSignatures>