This simple blog I would like to give you an idea on what is XSD, DTD and explain DTD vs XSD. This knowledge is a must when you want to build interface in SAP PI/PO as you know PI/PO uses XML as its message representation. So, all the structure in PI/PO is defined either with DTD or XSD.
Unfortunately, All the above topic are not covered in this blog but you can take this course to learn from here.
There is a prerequisite for the students who are learning this topic for the first time and not sure what is XML then refer this blog.
I will write this blog with the understanding that you have gone thru the introduction class so that I can use the terminology I discussed in the above and extend to learn DTD and XSD.
What is XSD?
XSD stands for XML Schema Definitions or in simple words it is Define XML Structure.
XML Schema is a new terminology you will hear a lot in XML which is actually means representation of a Structure and content.
Schema in general English means representation of a plan. So, XML Schema means the representation of XML.
In XML, we store the data with the markups or tags. It is important to remember that XML has data.
XSD on the other hand defines how that data should be structured in XML.
I will give you an easy to remember definition
You can say XML has data and XSD has rules.
XSD defines what elements and attribute can be represented in XML document.
What is DTD?
You need to understand that DTD is similar to XSD. It is also a rule file for XML conceptual wise both are used to define rules.
But DTD came first then later XSD. After working with both I can say DTD is used for simple types and XSD can be used for both Easy and complex scenarios. DTD does not differentiate data in detail level like integer and date but XSD does.
The major difference for me is DTD syntax based on SGML (does not looks like XML) and XSD is pure XML. So the advantage is that I don’t have to learn some or remember something new.
DTD stands for Document Type Definitions. It defines the element structure and what data is holds.
DTD vs XSD:
Below are the difference between DTD vs XSD.
Take this course to learn the below topics in detail.
- We will learn about XSD and its usage.
- How to write XSD and Validate XML with it. Will play around to see how it behaves.
- Then we will look at DTD and its benefits
- We will then Valid the XML against the DTD
- To get things clear we will compare XSD and DTD and understand it better.
- Finally, I will show you some handy tools that I use personally and which benefits me a lot. These tools will help you to check XML is formatted, Validate XML vs DTD or XSD.