XML (Extensible Markup Language) is the data format that is supported by SOAP (Simple Object Access Protocol) Web services to establish communication between web services consumers and web services providers. XML is a standard format that allows data to be exchanged across different platforms and applications. SOAP Web services use XML to encode the messages and data that are sent and received between the web services endpoints. Reference:

Budgetary control is a feature that allows you to monitor and control project costs against approved budgets. You can enter the amounts in the budget versions for these projects at two levels: Task and Project. These levels correspond to the budgetary control levels that are defined for the project type. You can also view and compare the budget amounts and actual costs at these levels using reports and dashboards. Expenditure Type, Top Resource, and Expenditure Category are not levels at which you can enter the amounts in the budget versions for these projects. These are attributes that can be used to group and filter the budget and actual amounts for reporting purposes. Reference:

To put in a validation process that allows only a certain number of maximum hours an employee can charge in a day, and a minimum of hours he or she can report in a week, you need to use time entry rules. Time entry rules allow you to define the conditions and actions for validating time entries based on various attributes such as hours, dates, projects, tasks, etc. You can also specify the error messages and severity levels for the time entry rules. Reference: