Get NameID from Subject Section

[Cantor, Scott]

https://wiki.shibboleth.net/confluence/display/SP3/XMLAttributeExtractor

"Each <am:Attribute> child element installs a rule for extracting a particular SAML Attribute or type of Name Identifier into an internal SP attribute. The source of the attribute is identified with the name (and possibly nameFormat) XML attributes and internally tagged by the id.

The name property in the rule corresponds to the Name XML attribute of a SAML <saml2:Attribute> or <saml1:Attribute> element or the Format XML attribute of a SAML <saml2:NameID> or <saml1:NameIdentifier> element."

https://wiki.shibboleth.net/confluence/display/SP3/XMLAttributeExtractorExamples

-- Scott