1.2.1 Normative References

[ElementTraversal:2008] Schepers, D. and Berjon, R., Eds., "Element Traversal Specification", W3C Recommendation, December 2008, http://www.w3.org/TR/2008/REC-ElementTraversal-20081222/

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, http://www.rfc-editor.org/rfc/rfc2119.txt