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XML Views 

<mvc:View
    xmlns:mvc="sap.ui.core.mvc"
    xmlns:layout="sap.ui.layout"
    xmlns:form="sap.ui.layout.form"
    xmlns="sap.m">
</mvc:View>

One of the required namespaces can be defined as the default namespace (xmlns=”…”). The control tags for this namespace do not need a prefix.

  • Keep this un-prefixed control tag always to the very same library sap.m in all view XMLs of your project!
  • Keep each named prefix constant throughout your project.