Menu
I want a page like this:
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:m="mine.xsd">
<m:dialog m:title="Hello">Hi there!</m:dialog>
</html>
How can I write "mine.xsd"?
456
XML Namespaces - The xmlns Attribute When using prefixes in XML, a namespace for the prefix must be defined. The namespace can be defined by an xmlns attribute in the start tag of an element. The namespace declaration has the following syntax. xmlns:prefix="URI".
An XML namespace is a collection of names that can be used as element or attribute names in an XML document. The namespace qualifies element names uniquely on the Web in order to avoid conflicts between elements with the same name.
One of the primary motivations for defining an XML namespace is to avoid naming conflicts when using and re-using multiple vocabularies. XML Schema is used to create a vocabulary for an XML instance, and uses namespaces heavily.
xsd files are XML Schema files, read about it. Some more here.
A simple example:
XMLSchema1.xsd
<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="Types"
targetNamespace="http://tempuri.org/"
elementFormDefault="qualified"
xmlns="http://tempuri.org/"
xmlns:mstns="http://tempuri.org/"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
>
<xs:simpleType name="Types">
<xs:annotation>
<xs:documentation>.NET types</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:string">
<xs:enumeration value="String" />
<xs:enumeration value="Int16" />
<xs:enumeration value="Int32" />
<xs:enumeration value="Int64" />
<xs:enumeration value="DateTime" />
<xs:enumeration value="Double" />
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="DataSize">
<xs:annotation>
<xs:documentation>Number of bytes of the data</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:int" />
</xs:simpleType>
<!-- ... -->
</xs:schema>
Then in your XML file you can use:
<?xml version="1.0" encoding="utf-8" ?>
<ValueSet
xmlns="http://tempuri.org/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://tempuri.org/ XMLSchema1.xsd">
<Values>
<Value Name="Stats" Type="Int32" DataSize="4" />
<Value Name="Time" Type="DateTime" DataSize="4" />
<Value Name="Some" Type="Double" DataSize="4" />
<Value Name="Other" Type="Double" DataSize="4" />
</Values>
</ValueSet>
You can write that XSD file yourself, by hand - you just need to study what makes up the XML schema, and get to know how to write that code yourself. Google or Bing for "XML Schema Tutorial" should give you a ton of hits (e.g. the W3Schools XML Schema Tutorial).
Or you could use Visual Studio to do this:
Example image
XML menu, choose the Create Schema menu itemThis will generate an XML schema from your XML file.
Note: this is a good starting point - but it's by no means perfect. Especially with smaller XML files, there are lots of things the generation process cannot know and it just has to make certain assumptions - which might be right or might be wrong. You will need to have a look at the XML schema file for sure - and that's where the know-how from the first option comes into play very handily!
43
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
