Answer:
Rootkit.
Explanation:
Rootkit is a collection of software tools,mostly malicious.These are mostly used by hackers to obtain administrator permission to a computer by masking intrusion.
Root-kit is made from two word Root and kit.Where root refers to the name of privileged account on an operating system that is somewhat like unix and KIT refers to the tools used.
Answer:
It will bring more verstality in his website. He will be able to define tags.
Explanation:
XML allows to define your own tags. You can bring semantics into your website which make data browsing easier.
It could fail, it would take a long time setting it up and aslo it could be easily hacked.