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Hello there, I am Sanjay Gupta. Here is my ‘5 minute XML’ series the place where I will offer you normal byte size guides.
The present topic is designed for individuals who are a new comers to XML.
During ?XML Schema – Overview? (5 Minute XML #7), I discussed the need for a schema definition language. I outlined principle syntax meant for revealing the namespace on the schema document as well as W3C URI (for referencing components and attributes not defined inside the targetNamespace).
In closing I referenced the following schema attribute: .
In the following, I’m hoping to explain why and how this attribute is commonly employed and precisely what influences it brings to bear.
To put it differently an XML schema is seen as a group of rules or specification if you like, which a programmer would probably apply to spell out the structure of an XML document. By way of example with a database schema will explain the data which could be found in a database (table structure, data types, etc.) An XML Schema will be much the same for an XML document, it is effectively a rule set.
A schema by itself could be made up of components from a variety of schemas each in its own namespace. A schema designer needs to decide whether to reveal or possibly hide these namespaces towards the instance doc. The elementFormDefault schema attribute allows them to do just this.
Setting elementFormDefault=”unqualified” (the default) will hide (or localise) the namespaces, whereas setting it to “qualified” will expose the namespaces defined within the schema to the instance doc.
One example is the schema beneath describes a car which generally sources components coming from three or more other schemas.
The chassis, wheels and interior are all derived from distinct manufacturers.
Car.xsd
?
?targetNamespace=”*.car.org”
?xmlns=”*.car.org”
?xmlns:ford=”*.ford.com”
?xmlns:toyota=”*.toyota.com”
?xmlns:audi=”*.audi.com”
?elementFormDefault=”unqualified”>
?
?schemaLocation=”Ford.xsd”/>
?
?schemaLocation=”Toyota.xsd”/>
?schemaLocation=”Audi.xsd”/>
Bear in mind the import elements. These enable entry to elements via the several manufacturers. Notice moreover that typically the schema attribute elementFormDefault will be set to unqualified. This approach conceals the varying manufacturers? namespaces from any kind of instance doc. This kind of an instance document could look something for example :
Car.xml
Ford F-Series F-150 Regular Cab 2WD
Pirelli P3000
?leather
Primary the car root element namespace qualifier is exposed in the instance document, above. The distinct car makers providing the actual numerous components are at this point concealed or ?localised? to the schema definition. The instance record doesn?t worry itself with wherever the components tend to be taken from. Just that they are obtainable.
If perhaps, on the other hand, elementFormDefault had been set to qualified we would have a different story?
These will certainly be introduced from another 5 Minute XML guide.
A great deal of information and facts are available regarding XML should you want to understand more. For the definitive guide, visit www.W3.org.
I am hoping the above is advantageous to somebody out there. Much more article content will likely be on its way soon enough.
Sanjay Gupta is undoubtedly an experienced practitioner in XML programming and XML standards and possesses plenty of working know-how about XML Editor along with useful know how with XML Schema Editor.
Article source: http://document.ezinemark.com/the-particular-elementformdefault-schema-attribute-7d3041d72e34.html.
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