def METHOD_NAME(district_iri, ppi_iri):
    # Instantiate property price index for a given administrative district
    query = f"""
        INSERT DATA {{
            <{ppi_iri}> <{RDF_TYPE}> <{OBE_PROPERTY_PRICE_INDEX}> . 
            <{ppi_iri}> <{OBE_REPRESENTATIVE_FOR}> <{district_iri}> . 
        }}
    """
    # Remove unnecessary whitespaces
    query = ' '.join(query.split())
    return query