For example, a company in Chicago might develop a web application using Java and another company in New York might develop an application in C and when these two companies decided to share information then XML comes into picture. It helps to store and transport data between two different applications that are developed using different technologies.
Note: It is not limited to a programming language, please do research on the information transportation between two different apps. XSD is a schema definition. By that what I mean is, it is telling users to develop their XML in such a schema. Please see below images, and please watch closely with "load-on-startup" element and its type which is integer.
One has to see XSD and create XML in such a way or else it won't communicate with another application or system which has been developed with a different technology. If the company in Texas failed to adhere with those rules or schema mentioned in XSD then it is impossible to expect correct information from the company in Chicago. To view the documents in each catalog, expand the catalog node. The list of documents present in the catalog is shown in the tree. You cannot add schemas to the system catalog, and schemas in the system catalog cannot be resynchronized.
This is indicated by a key icon on these nodes. The User-defined Catalog contains schemas that you have imported. These schemas can be resynchronized, and you can add new schemas directly to this catalog. The following figure shows an example of this. Click a document bundle in the tree to list the versions that have been imported. Click a version to list all the documents contained in that version.
A read-only view of the source is shown in a tab on the right. To add an XML schema to the user-defined catalog in the global cache, perform the following steps:. The Load Schema dialog enables you to load a schema directly from the file system. In the File location field, enter or browse to the location of the schema file and click Next. In the Retrieve and Validate window, enter a user name and a comment for this version of the schema.
Click Next. If the XML schema fails validation, an error is displayed. Click the Finish button to import the schema into the cache. Alternatively, you can import a WSDL document directly into the cache. To add a WSDL to the global cache, perform the following steps:. Select the appropriate option and enter or browse to the location of the WSDL file in the fields provided. Click Next to continue. If the WSDL fails validation, an error is displayed. This enables you to import a more recent version of a WSDL or schema directly to the global cache.
This defaults to the location from which the WSDL was originally loaded. An order header record has fields e. Consistency is more important than anything else. Develop a standard in your organization and follow it. As XML progresses as the de facto standard for data transmission, element-naming conflicts will become inevitable when you bring two business-defined XML documents into a single file. Additionally, when your own standards change, you may need to support old versions along with the new.
Namespaces were added to XML to address these concerns. Namespaces will become more useful as XML acceptance grows and companies start rewriting first rounds of web service implementations. Namespaces work much like the prefix keyword in RPG programs for redefining fields for a file on the F-spec.
Figure 7 shows two physical files that have some same-named fields i. You can address this problem with the prefix keyword Figure 8. To qualify XML elements in a document, specify the xmlns attribute Figure 9. The syntax for specifying namespaces is. If you have only one namespace in a document, you can omit all xmlns declarations.
If I have two or more namespaces, I usually pick as the default the one with the most elements to be used. I save more bits and bytes by not having to qualify the majority of the elements. SOAP is often perceived as complicated because of its obscurity — one possible reason for the fact that most implementations use a very small portion of the specification. Rather, SOAP was meant to be under-the-covers technology.
Remember, SOAP is nothing more than text. We added a SOAP envelope and body to facilitate purist web services. We can now compose the RPG program necessary to create this web service on our System i. In this case we use "literal".
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