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Template Attributes

Datafile Software

Template Attributes


Attributes are used in XML files to provide extra information about the data in that element. They are specified by the schema designer, and take the form word="value".

E.g:
<BuyersOrderNumber Preserve="true">

The Preserve="true" attribute here was created to say that this element must be returned intact in any reply message — so it is as much a note to the schema designer of any reply message in this case. Or again:

<OrderLine Action="Add">

The "Action” attribute here could have a value of "Add”, "Change” or "Delete”, which this time determines how the element is to be treated by the receiving trading partner. Attributes are always contained within the opening element tag, and their value is always enclosed within quotes after an equals sign. There is no limit to the number of attributes that can be defined for an element, but any one attribute can be used only once.

Datafile Attributes

Datafile uses attributes in the XML template as a way to tell our XML processor how to process this element (and any child elements). These attributes are not passed to the output XML file, nor expected to be present in an incoming one. Datafile template attributes that are not recognised as Datafile-defined ones — in other words the attributes specified by the schema designer — are passed unchanged into any output XML file.

If an attribute is present in an incoming file, but is not included in the Datafile template, then the element is processed as though the attribute was not present. Where different processes are to be invoked according to the value of the attribute — as you would expect with the "OrderLine” element above — then the Datafile template must include an element (and any child element set) for each of the possible attribute values.
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