. In this exercise we shall explore a simplified use case scenario for XML: storing medical information We are interested in storing basic information about hospitals, doctors, patients and their illness. Each hospital houses several patients. Patients may be registered with multiple hospitals (possibly for different illnesses). Each doctor is employed by a hospital, and may attend to multiple patients in the hospital. We want to store some basic information about each of the entities involved. For instance, a hospital may be characterized by an id, name, and location, a patient may have an id, date of birth, information about illnesses, hospitals attending, with joining dates, etc (a) Write a simple DTD (Healthcare.dtd) for this application. (b) Create a sample XML (Healthcare.xml) document respecting your DTD, and containing information about a few hospitals, patients, and doctors. (c) Write a program parse the XML and validate it against the DTD to display the information using any of your favorite programming language 2. Consider the following ER diagram. Number Year Qtr SECTION Students attended Ssn Name Class Grade Course_number STUDENT Course name (a) Write the DTD (Sections.dtd) corresponds to the hierarchy shown in the above design. (b) Consider your DTD and create a sample JSON (Sections.json) document containing information about a few sections, students and their grade (c) Write a program to parse the JSON and display the information using any of your favorite programming language