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toxml() Function

Function

toxml( value, format, name, namespace )

Converts a value to its equivalent XML form.

Parameters

Keyword Type Description

value

Any Type

The value or variable (PV, ACP) to be converted to XML.

format

Boolean

Whether or not to format the result. If true, the resultant XML is formatted with line breaks and indenting, otherwise it uses a compact notation. If not given, the result is unformatted XML.

name

Text

The name to use as the root element name in the resultant XML. If not given, the name of the data type of the variable passed as the value parameter is used.

namespace

Text

The namespace to use as the default namespace in the resultant XML. If not given, the namespace of the data type of the variable passed as the value parameter is used.

Returns

Text

Usage considerations

This function supports primitive system data types, custom data types, and the following complex system data types: LabelValue, LabelValueTable, PagingInfo, SortInfo, and DataSubset.

The XML structure for Complex System Data Types and Appian objects is not guaranteed to remain the same from release to release.

Examples

You can copy and paste these examples into the Expression Rule Designer to see how this works.

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toxml(a!paginginfo(startIndex: 1, batchSize: 10))

returns

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<a:PagingInfo xmlns:a="http://www.appian.com/ae/types/2009">
 <startIndex>1</startIndex>
 <batchSize>10</batchSize>
</a:PagingInfo>

A well-formed XML document has a single root element. When you pass a list into toxml(), you get an XML snippet of multiple elements. To end up with a single-root XML document when passing in a list, use a parent-level xml element.

By wrapping it with a root element, you end up with a well-formed single-root XML document.

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a!localVariables(
  local!data:{​{ id: 1, value: "First value"}, { id: 2, value: "Second Value"}},
  "<root>" & toxml(local!data) & "</root>"
)

returns

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<root>
  <a:Dictionary xmlns:a="http://www.appian.com/ae/types/2009" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><id xsi:type="xsd:int">1</id><value xsi:type="xsd:string">First value</value></a:Dictionary>
  <a:Dictionary xmlns:a="http://www.appian.com/ae/types/2009" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><id xsi:type="xsd:int">2</id><value xsi:type="xsd:string">Second Value</value></a:Dictionary>
</root>

Feature compatibility

The table below lists this function's compatibility with various features in Appian.
Feature Compatibility Note
Portals Partially compatible

Can be used with Appian Portals if it is connected using an integration and web API.
Offline Mobile Partially compatible

Can be used with offline mobile if it is loaded at the top of the form.
Sync-Time Custom Record Fields Incompatible
Real-Time Custom Record Fields Incompatible
Process Reports Incompatible

You cannot use this function to configure a process report.
Process Events Incompatible

You cannot use this function to configure a process event node, such as a start event or timer event.

toxml() Function

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