The hierarchical property of XML makes it more suitable for complex data structures. XML allows the creation of nested elements, forming a tree-like structure that can represent intricate relationships and organize data in a way that is both meaningful and versatile.

SSL certificates in web services are used to authenticate servers, ensuring that clients are connecting to legitimate and secure servers.

WS-Security is primarily used for ensuring security in messages exchanged between web services. It provides a set of specifications that enhance the integrity and confidentiality of the communication, addressing concerns related to authentication, encryption, and the prevention of message tampering.

Cross-Site Scripting (XSS) attacks commonly exploit vulnerabilities in JavaScript to inject malicious scripts into web pages.

SSL/TLS in web services is primarily used to encrypt data transmission, ensuring secure communication between clients and servers.

SQL Injection is primarily used for gaining unauthorized access to a database by injecting malicious SQL queries.

Apache JMeter is a popular tool used for load testing of web services, allowing testers to simulate various user loads and analyze system performance.

AWS EC2 (Elastic Compute Cloud) provides scalable computing capacity by allowing users to run virtual servers in the cloud.

For a service requiring detailed and structured contracts, SOAP (Simple Object Access Protocol) would be a more appropriate choice over REST (Representational State Transfer). SOAP provides a formal contract through WSDL (Web Services Description Language), making it suitable for scenarios where a strict and defined interface is crucial. REST, on the other hand, is more flexible and often preferred for lightweight and loosely-coupled systems.

Azure Functions is a serverless compute service that allows you to run event-triggered code without explicitly provisioning or managing infrastructure.