WEB TECHNOLOGIES UNIT-5 | Degree 4th sem BCOM Computers web technologies unit-5 full explanation💯✅

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[00:00:00]Hello dear students, welcome back to YouTube channel Learn with Sahira. In this video, we are going to see the complete and easy explanation of unit number five from the subject Web Technologies, which is for degree fourth semester B.Com Computer Application students. After watching this one single video, I can confidently say you that you will become perfect in unit number five. So, definitely watch the video till the very end and if you're new to our YouTube channel Learn with Sahira, subscribe it for more exam preparation videos. Students, one important thing I have personally prepared dam sure important question and answers notes for all subjects and languages of degree fourth semester. These notes are easy, simple, clear to understand and 100% exam oriented. If you want these notes for quick exam preparation, you can message me on my Instagram. My Instagram ID is Learn with Sahira. Link is available in this video description.

[00:00:46]Just message me want notes along with your group and semester. I will be giving you the access to all the notes.

[00:00:51]But, remember students, there is a small payment for the notes. Yes, these are paid notes, but believe me, you are going to see excellent results with these notes. Only the students who want the notes should text me. And if you want to watch all explanation videos of this subject, do visit our YouTube channel's playlist semester for Web Technologies. You will be finding all the videos there. That playlist link is also available in this video description. Do check it out. Without getting late, let us get started.

[00:01:15]Students, question number one is explain about XML style sheets. Please try to understand. XML style sheets are used to decide how XML data should be displayed on the screen.

[00:01:27]Please know this that in XML, we only store the data. Okay, XML does not focus on design or appearance. So, if we open an XML file without any style, it will look plain. It will look unformatted or difficult to read. So, to make this data look neat and understandable, we will be using style sheets. Simple idea, students. XML stores the data and style sheet will show how the data should be looking. So, unlike HTML, XML does not have predefined designs, students. It only focuses on storing the data in structured format. So, because of this, data is correct, but presentation is not good. For that reason, we will be using style sheets. Why we will be using style sheets? In order to add colors, in order to arrange the data, in order to make it readable. Okay. Now, let us talk about types. First type is CSS, cascading style sheet, students. These are used to change the appearance of XML elements, okay? It works similar to how we use CSS in HTML. Already we have discussed about CSS in HTML in our previous unit explanation videos. If you didn't watch previous unit explanation videos, playlist link is available in this video description. Do check it out. So, students, with CSS, we can change color, we can change font, adjust size, and add spacing. So, CSS improves only the look of the data, okay? It does not change the structure or order of the data. It only improves the look of the data. For example, if XML has names and marks, CSS can make names bold. It can change background color. But data will remain in the same order. We are just changing the appearance. Now, if we talk about the second type, extensible style sheet language, it is more powerful than CSS, okay? It is used not only for styling, but also for changing and organizing the data. With XSL, we can convert XML into HTML. We can display the data as tables or lists. We can rearrange the elements.

[00:03:25]We can filter the data. So, XSL can change both appearance as well as the structure. For example, if XML has student data, XSL can show it as table.

[00:03:36]It can sort students by marks, or it can display only selected data. So, please try to understand the difference. CSS only changes the look, but XSL, it changes the look as well as it will change the structure. So, XSL is more advanced and powerful. Now, if we talk about the advantages, students, it makes uh XML data readable. It improves the presentation. It organizes information clearly, as well as it displays the data in user-friendly way. Just give a reading, that will be more than enough.

[00:04:05]If we talk about the conclusion, XML stylesheets are used to display XML data in a proper and readable format using CSS or XSL. This was the complete explanation of question number one. If you want in-detail explanation answers notes, which are very easy and simple to understand, you have to message me on my Instagram. Just by giving a reading in my notes, you will get perfect with the complete concept. You will be 100% perfect for your examination. Just a reading is enough in my notes. I have given detailed answers, okay? If you want those notes, you have to message me on my Instagram. These notes from where I'm explaining you, these are short notes prepared by me in order to provide you free explanations on YouTube, but paid notes are different. If those notes, message me on my Instagram. Now, let us talk about question number two.

[00:04:54]Explain about XML Document Object Model, XML DOM.

[00:04:59]Students, XML DOM stands for XML Document Object Model. It is used to access, read, and change data inside an XML document. Normally, XML just stores the data, students, but if you want to read specific data, if you want to change values, add or remove elements, we need XML DOM. So, XML stores the data. XML DOM helps us to work with that data. Now, if we talk about how it works or how this works, I can say you that XML DOM represents XML document in the form of a tree structure. Okay, there will be a tree structure. This means data is arranged like a tree with branches. Each part of XML is treated as a node, students. For example, elements, attributes, text, to are nodes in the tree. Let us try to understand the structure. You will be having good note about it. First, we have root node. The root node is the main element of the XML document. It is the top most part of the tree. Okay, all other elements come under this. Okay, so everything starts from the root. This is first top root node. Then we have parent node. A parent node is an element that contains other elements inside it. It acts like a container. Please hold us specifically.

[00:06:18]So, for example, if one tag has other tags inside it, then it is a parent. A A parent to us can the different elements say that okay, after root node, it is parent node. Then we have child node.

[00:06:30]These are the elements that are inside another element. Another element here is under the elements here. We call child node. They come under the parent node.

[00:06:38]Okay, these nodes usually contain the actual data. So, child nodes are connected to parent nodes.

[00:06:45]Now, we also have sibling nodes.

[00:06:47]Students, these are the elements that have the same parent. Yeah, I got same parent here. Same parent here under different nodes here. So, sibling node will take us. They are at the same level in the tree. We can say if two elements are inside the same parent, they are siblings. That's how our parents give up on children. Yeah, so we people have siblings, right? Like that, we do have these elements as well.

[00:07:09]Simple understanding of some job. Root node main element here. Parent node here. Well, it will contain other elements. A child node is inside the parent and sibling is same level elements of child node. Okay? And if we talk about why it is important, so basically it will help us to access any part of XML and it will change the value. It add new elements. It also deletes existing data. So, basically students, it makes XML dynamic instead of static. Okay? So, yes, this represents XML data as a tree structure and allows easy access and modification of the data. Now, if we talk about question number three, it is explain about XML query.

[00:07:52]XML query is also called XQuery, students. It is also called XQuery. Now, it is used basically to find and get specific data from an XML document, students.

[00:08:12]When an XML file is small, we can read it easily, but when it contains a lot of data, it becomes difficult to find what we need, right? So, XML query will help us to search for the data, extract the required information, as well as display only needed parts. So, simply, students, XML stores the data. XML query helps us to find required data. Now, if we talk about the purpose, why it is needed, in real applications, XML files can be very large, right?

[00:08:42]So, reading the entire file is not practical. Possibly not.

[00:08:46]So, instead, we may need only a particular value or a specific element or filter the data. For that reason, we will be using XML query. Now, let us talk about the functions. First, it is searching the data. It is used to find specific data inside the XML document.

[00:09:01]So, instead of checking everything, we can directly locate the required element. For example, if we want a student's name, we can search only that particular part. So, it saves time as well as effort. Retrieving the data, students, it means getting the required data from the XML file. After finding the data, we extract and display it. So, instead of showing the full XML file, only useful data is shown. That is nothing but retrieving. It means getting the required data. Filtering data, students, it is used to select data based on the conditions. We can apply conditions like I just want the marks which are greater than 50 or I just want the people whose age is less than 25.

[00:09:38]So, only matching data will be selected in filtering the data. Sorting data, it is used to arrange the data in a proper order. We can arrange the data in ascending order or descending order. For example, sorting the students by marks or names. So, basically this will improve readability and presentation.

[00:09:53]Please try to understand. Searching the data to find the data, retrieving the data to get the data, filtering the data to select the data with conditions, sorting the data is to arrange the data.

[00:10:03]Now, if we talk about the advantages, it is used to handle large XML files. It is to get only the required data. It is to improve speed and efficiency. Also, to uh organize output properly, students.

[00:10:16]This is what it is about. Now, if we talk about the conclusion, we can say it is used to search, retrieve, filter, and organize the data from XML documents efficiently or in good way.

[00:10:28]Next question is question number four.

[00:10:30]What is XML? Write about the features of XML. Students, XML stands for Extensible Markup Language. It is basically used to store, organize, and transfer data. So, in XML, we can create our own tags to present the data, students. For example, instead of fixed tags like HTML, we can write name like this tag, name, then we will be closing the tag. Marks tag, student tag. So, XML is mainly used to store the data in structured way. Now, if we talk about the features, first let us talk why it is used, students. Why XML is used? It is used when we want to store data properly or when we want to share the data between systems or when we want to transfer data from one application to another application.

[00:11:15]Basically, this is used for that reason.

[00:11:17]Features, extensible, students. It is extensible, which means we can create our own tags. There are no fixed tags like HTML. So, depending on the requirement, we can design our own structure. For example, employee, uh salary, name. Basically, any tag we can create. This will give flexibility. Then we have self-descriptive.

[00:11:38]Uh it is self-descriptive, which means the tags clearly explain the data. When we use XML file, we can easily understand what the data will represent.

[00:11:47]Okay. So, yes, this is so no extra explanation is needed. We will be clearly understanding what it is. Then platform independent, students. It works on all systems and platforms. It does not depend on any on any specific software or operating system. So, data can be shared easily between different computers or different applications. Har ek system pe wo work karta. Aisa nahi hai ki sirf Linux pe karta, sirf Mac pe karta. Aap same cheez kaun se bhi system pe chala sakte. Windows pe chala sakte, Mac pe, Linux pe, kis pe bhi chala sakte. It is platform independent. It is simple and easy, students. It has simple and clear structure. It is easy to read, write, and understand. Even beginners can learn XML quickly. Because of this, errors are also reduced. Then it supports the data storage and transport. XML is used to both store the data as well as transfer the data. Basically, it will helps in sending data from one system to another.

[00:12:41]Okay, for example, from server to client or between the applications. So, it plays an important role in communication, we can say. XML stores the data. Custom tags help karne ke liye hame flexible banane ke liye clear structure hai, which is easy to understand. And it works everywhere. Platform independent hai.

[00:13:00]These are few advantages you can see.

[00:13:02]Now, if I talk about the conclusion, it is XML is used to store the data as well as transfer the data in structured and flexible way. And its feature makes it easy to use and widely applicable, we can say. This was the complete explanation. How was the explanation?

[00:13:17]Let me know in the comment section. If you want in detail explanation answers notes, message me on my Instagram. Join our Telegram channel for important updates. Do check out our YouTube channel's playlist semester four web technologies for all explanation videos.

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