Writer Basic: How to set text locale to None

I want to avoid spellchecking of some words/phrases in my doc.
I want to use macro like this:

Sub setNoLangToSpecificText(sSpecificText As String)
Dim oSrchDescr As Variant
Dim aFound As Variant
Dim oNextText As Variant
Dim oLoc As New com.sun.star.lang.Locale 
Dim i As Long
oLoc.Language = ""
oSrchDescr = ThisComponent.createSearchDescriptor()
oSrchDescr.SearchRegularExpression = True
aFound = ThisComponent.findAll(oSrchDescr)
For i = 0 To aFound.getCount() - 1
    oNextText = aFound.getByIndex(i)
    oNextText.CharLocale = oLoc
Next i

End Sub

What should I assing to oLoc.language to set the text’s language to “None (Do not check spellig)”
When I assing empty string “”, it will use Default locale.

As you could find out by inserting a command like print oNextText.CharLocale.Language before oNextText.CharLocale = oLoc, and running this through a document with language preset to “None”, this is “zxx” (see ISO 639).

“zxx” works, but it is really strange. Anyway Thank you.