Use xe:djextListTextBoxto collect and display multiple values, use xe:valuePickerto add values ββfrom an existing list to a ListTextBox, and use optionally buttonto request a new value and add it to a ListTextBox.
This is an example for xe:djextListTextBoxand xe:valuePicker:
<xe:djextListTextBox
id="djextListTextBox1"
multipleSeparator=","
multipleTrim="true"
defaultValue="abc,def"
value="#{viewScope.test}">
</xe:djextListTextBox>
<xe:valuePicker
id="valuePicker1"
for="djextListTextBox1"
pickerText="Add">
<xe:this.dataProvider>
<xe:simpleValuePicker>
<xe:this.valueList><![CDATA[#{javascript:
["abc","def","ghj","klm","nop","xyz"]
}]]></xe:this.valueList>
</xe:simpleValuePicker>
</xe:this.dataProvider>
</xe:valuePicker>

I like this approach as it is easy for the user to add and remove values ββand it looks good.
xp:inputText xe:valuePicker:
<xp:inputText
id="inputText1"
multipleSeparator=","
value="#{viewScope.test}"
defaultValue="abc,def">
</xp:inputText>
<xe:valuePicker
id="valuePicker1"
for="inputText1">
<xe:this.dataProvider>
<xe:simpleValuePicker>
<xe:this.valueList><![CDATA[#{javascript:
["abc","def","ghj","klm","nop","xyz"]
}]]></xe:this.valueList>
</xe:simpleValuePicker>
</xe:this.dataProvider>
</xe:valuePicker>

, InputText . , , , .
, xe:djTextarea multipleSeparator :
<xe:djTextarea
id="djTextarea1"
multipleSeparator="#{javascript:'\n'}"
value="#{viewScope.test}"
defaultValue="#{javascript:['abc','def']}"
cols="30">
</xe:djTextarea>
<xe:valuePicker
id="valuePicker1"
for="djTextarea1">
<xe:this.dataProvider>
<xe:simpleValuePicker>
<xe:this.valueList><![CDATA[#{javascript:
["abc","def","ghj","klm","nop","xyz"]
}]]></xe:this.valueList>
</xe:simpleValuePicker>
</xe:this.dataProvider>
</xe:valuePicker>

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