XML Namespace tutorial for complete Beginners
Aug 15, 2023
XML Namespace tutorial for complete Beginners
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Content
0.81 -> Hello and welcome to this session I am Raghav
and in this session, We are going to learn
6.06 -> all about XML namespace Do not worry If you
have no prior knowledge on this topic I will
11.55 -> go very basic step by step and we will start
from scratch. So let's get started Let us
17.57 -> see this example We have an XML where we have
a table element and inside the table element
24.38 -> We have 3 more elements and with the information,
it is giving us It looks like we are talking
31.15 -> about a Furniture table here. If you look
at this another XML here again, we have our
36.81 -> table element and then we have elements like
TR TD, which is for rows and columns and it
43.6 -> looks like here we are talking about HTML
table Now This is all fine If these two tables-
49.53 -> if these are two XML's I used separately and
they are not associated with each other in
55.79 -> any ways However, if we happen to combine
these To xml's together, they will be a conflict
63.31 -> because of the common table element and to
resolve this conflict We can use a prefix
69.229 -> in our elements For example, if I talk about
the furniture table here, I can add a prefix
76.17 -> and here you can see we have added a prefix
called f for all the elements here And now
83.149 -> for the HTML table we can do something similar
here We have added a prefix h in front of
90.74 -> all the elements and now these two elements
are different and they can be used together
97.49 -> and then they will be no conflict because
we are using different names now until now
103.899 -> we have just talked about prefixes that will
help us to resolve the conflicts when we have
110.42 -> common elements We need to understand about
the XMLns or XML namespace attribute whenever
117.549 -> we are using prefixes in our XML a namespace
for the prefix must be defined and here is
124.289 -> the syntax We say xmlns whatever the prefix
we have used equals to our URI For example,
133.53 -> if we happen to combine our earlier 2 xml's
together. I will create a root element and
139.18 -> then here we have our first XML that talks
about HTML table and here we have a prefix
146.599 -> H already added to all the elements and here
I will say xmlns:h which is the prefix equals
154.69 -> to r u r i so this is how we can declare a
namespace and the namespace can be declared
161.879 -> and defined in the starting of the element
or the starting of the XML in the root element
166.87 -> itself And then all the child elements for
that particular tag or element will be associated
173.51 -> with the same namespace and here you can see
the other XML here I can define a XML namespace
181.98 -> attribute like this and I will give the prefix
here and this is how I can Define it and we
188.129 -> can also Define or declare all the name spaces
in the root element itself so that we do not
194.65 -> have to Define him Define the XML namespace
or declare them every time in the rest of
201.439 -> the XML here is how we do that You can see
I have defined both the XML namespaces in
208.299 -> the root element itself Now I do not need
to declare them again in the XML Let me show
214.34 -> you an example I will go to Google and search
for Sample web service so that I can show
223.86 -> you some XML and I'm going to this calculator
web service here And here if I go to this
230.659 -> service description, which will be a XML document
You can see here All the namespaces are declared
238.599 -> in the starting in the root element itself
And then in the rest of the XML I do not need
243.53 -> to declare them again, I can directly use
the prefixes and this is how we can use a
250.079 -> XML namespace now We need to understand about
default name spaces Now if you define a Default
258.85 -> namespace for an element all the child elements
will be associated with that name space and
264.53 -> it will save us from using prefixes in all
the child elements. And this is how we do
271.319 -> it We say XMLns = namespace URI and here you
can see an example here I have added the XML
279.6 -> namespace attribute and all the child elements
will be now associated with this XML namespace
285.449 -> and I do not need to add the fixes for all
the elements and this is another example,
292.509 -> let me show you here This is our XML document
and this is actually a wsdl which is web services
299.59 -> description language And this is what we use
in soap API's Now do not worry about that
304.229 -> I have a separate video to explain what is
wsdl, but just for parsing this document this
310.069 -> XML document I can use a extension on my Chrome
browser So if I go to the web store and On
318.361 -> my Chrome I can use extension called Whistler
and this is used to parse a wsdl document
327.59 -> And this is the extension I have already added
it And here it is This will pass the XML document
334.3 -> So I will click this and it shows me all the
services in this XML I can click on any of
339.83 -> the service and it shows me the XML of that
API service or that request and here you can
346.36 -> see this is how we can define a XML namespace
and all the child elements will be associated
353.72 -> with this particular namespace now in case
any of the child elements needs to be associated
359.48 -> with a different name space You can also do
like this So here the add element belongs
365.05 -> to this namespace and all its child elements
will now be associated with this particular
370.05 -> namespace. So this is how you can Define default
namespaces now Wikipedia says that XML Spaces
378.83 -> are used for providing uniquely named elements
and attributes in an XML document and I hope
385.47 -> now you understand this. We have learned this
in a very simple way I hope all this was useful
390.55 -> You can go and share your knowledge with everyone
also Let me know how did you like this video
395.419 -> and I will meet you in the next session Thank
you for watching.
Source: https://www.youtube.com/watch?v=VTQRGDhH6WQ
