What is an "attribute" and what is "attribute management"?

Review of attribute definitions:

• ITUT : Definitions about entities : http://www.itu.int/itu-t/recommendations/rec.aspx?id=10440
• ITUT ; X.520 Information technology – Open Systems Interconnection – The Directory: Selected attribute types http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.520-200811-I!!PDF-E&type=items
• SAML : http://saml.xml.org/saml-specifications
• Internet2 : https://spaces.internet2.edu/display/macepaccman/Another+Glossary+Page
• (Additional) : https://wiki.jasig.org/display/FIFER/OSS+IDM+Functional+Areas
• InCommon (Federation) : http://www.incommon.org/attributes.html
• InCommon (IAF) : http://www.incommon.org/docs/assurance/IAAF_V1.1.pdf
• OASIS : http://www.idmanagement.gov/documents/SAML_V2_IP_Profiles.pdf
• NASPO : http://www.naspo.info/PDFiles/IDPV_PBP_WorkProgressReport.pdf
• GFIPM : http://gfipm.net/standards.html
• GOSAC-N : http://www.gosac-n.org/documentation
• NIEM: https://www.niem.gov/Pages/default.aspx
• Microsoft: http://msdn.microsoft.com/en-us/library/windows/desktop/ms675090%28v=vs.85%29.aspx
• Schema.org: http://schema.org/docs/full.html