XML JForm form definitions
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Joomla! 
and newer supply the JForm class to conveniently and flexibly create forms with a large amount of form fields. JForm can create forms from XML form definitions. These can be standalone files or sections of other files, notably manifest files.
Syntax[edit]
The root element for JForm definitions is usually <config>. Under the <config> element, one or more <fieldset> elements may appear, each representing a HTML <fieldset>, a group of form fields visually grouped together. The optional name attribute can be used on the <fieldset> to define the name of the fieldset, as in <fieldset name="params">.
Each fieldset must contain one or more <field> elements, each representing a single form field with a label. See Standard form field types for a list of allowed form field types and example XML form field definitions.