Validating user input in c
Directives are a mechanism to declare variables and constants and namespace aliases which need to be referenced in the Document.They are also needed to declare the type of the output of your transform.Whenever the output is of XML or JSON type and has null values in its elements or attributes, you can specify whether this generates an outbound message that contains fields with "null" values, or if these fields are ignored entirely.
Inputs are declared by assigning a name and a content type.
You may define as many input directives as you want.
Whenever you make a transformation from JSON to XML, make sure that the resulting output is valid as an XML file.
Specifically, make sure that there’s a single parent tag, JSON supports having multiple elements at the highest level while XML doesn’t.
You can either manually add the attributes to the project’s XML, or do it through the graphical interface, by selecting the element from the tree view in the input section and clicking the gear icon. The Output Directive specifies what the output type is in a transformation, which is specified using content/type.
Only one output can be specified, the structure of this output is then defined in the Data Weave body.
If using DW outside of Mule, you should declare an input directive '%input payload application/json' In Anypoint Studio, inputs are implicitly known based on the metadata that runs through the flow components.
If using DW outside of Mule, you should declare an input directive '%input payload application/xml' In Anypoint Studio, inputs are implicitly known based on the metadata that runs through the flow components.
Once you master the pattern language, most validation tasks become trivial.
You can perform complex tasks that once required lengthy procedures with just a few lines of code using regular expressions.
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