No property schema found. Add a property schema to this list to be able to promote property fields. A property schema is ...

No property schema found. Add a property schema to this list to be able to promote property fields. 
A property schema is a special kind of schema in which you list the properties you would like to promote. It has the following characteristics: 
(1) The names of the properties you would like to promote should be listed as element fields directly under the 'Schema' node of this property schema. 
(2) The 'Schema Type' property for this schema is set to 'property'.
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