Liquid XML Studio 2019
Data Mapping > Data Mapper Functions > By Category > String > Lower

Function Name
Convert text string characters to lower case
String Text String to convert to lower case
Result Text String with all characters converted to lower case
Culture Set culture for language data


The Data Mapper String Lower function converts text String characters to lower case. If your source XML contains characters you wish to be stored entirely in lower case within the target, you can apply this transform when mapping the data. Whether the characters are within element content or within attribute values, the transform will execute on them. To apply the String Lower transform function, use the following process:

Create a new Data Mapper file, dragging your XML data source and targets into the editor area. For this example we are using comment_source.xsd, an XML Schema Definition inferred from the following source:

Source XML
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<comment contributor="Mary">
 I really like this

For our target schema we will be using comment_target.xsd, inferred from the following XML:

Target XML
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 <content>I absolutely love this</content>

The data models user comments for a product or website. Here is the Data Mapper with Source and Target imported:

Data Mapper String Lower Function

Let's drag the String Lower function from the Component Palette into the mapping area:

String Lower Component

String Lower Transform Added

The String Lower function takes a single input and gives a single output. The input should be connected to the source text String item to be converted to lower case. The output should be connected to the target item. In this case we are mapping from an attribute to an element:

String Lower Transform Mapped

We map the "contributor" attribute in the XML Reader to the "user" element in the XML Writer, converting to lower case at the same time. Finally let's make the remaining input and output connections:

Input and Output Connections Mapped

We can now execute the transform by pressing Shift-F5 or the Execute button (Execute). The transform is applied and the file we selected as output opens in the editor:

Output XML
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  I really like this

The input attribute value has been converted to lower case as part of the mapping process.


If you happen to be dealing with different languages, the Lower function can also be tailored to suit. Within the mapping area, right-click the Lower function and choose Show Properties. You can choose languages from the Culture drop-down list and the Mapper will select lower case characters accordingly.

Choosing a Language for the Lower Function

This is a scalar function so the standard rules apply if multiple values are presented to one or more inputs.

See Also

Data Mapping