<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="response">
        <xsd:complexType >
            <xsd:sequence >
                <xsd:element ref="request_index" />
                <xsd:element ref="data_source" />
                <xsd:element ref="request"/>
                <xsd:element ref="errors"/>
                <xsd:element ref="warnings"/>
                <xsd:element ref="time_taken_ms"/>
                <xsd:element ref="data"/>
            </xsd:sequence>
            <xsd:attribute name="version" type="xsd:string" default="1.0"/>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="request_index" type="xsd:int"/>
    <xsd:element name="data_source" >
        <xsd:complexType>
            <xsd:annotation>
                <xsd:documentation xml:lang="en">
                    Specific source from dataserver request
                    ex: aircraftreports
                </xsd:documentation>
            </xsd:annotation>
            <xsd:attribute name="name" type="xsd:string"/>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="request" >
        <xsd:complexType>
            <xsd:annotation>
                <xsd:documentation xml:lang="en">
                    Request type
                    ex: retrieve
                </xsd:documentation>
            </xsd:annotation>
            <xsd:attribute name="type" type="xsd:string" />
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="errors">
        <xsd:complexType>
            <xsd:sequence minOccurs="0" >
                <xsd:element ref="error" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="warnings">
        <xsd:complexType>
            <xsd:sequence minOccurs="0">
                <xsd:element ref="warning" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="data" >
        <xsd:complexType>
            <xsd:sequence minOccurs="0" maxOccurs="unbounded">
                <xsd:element ref="AircraftReport"/>
            </xsd:sequence>
            <xsd:attribute name="num_results" type="xsd:int"/>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="warning" type="xsd:string"/>
    <xsd:element name="error" type="xsd:string"/>
    <xsd:element name="time_taken_ms" type="xsd:int">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                Time to process database request in milliseconds
            </xsd:documentation>
        </xsd:annotation>
    </xsd:element>
    <xsd:attribute name="num_results" type="xsd:int"/>
    <xsd:element name="AircraftReport">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element ref="receipt_time" minOccurs="0"/>
                <xsd:element ref="observation_time" minOccurs="0"/>
                <xsd:element ref="quality_control_flags" minOccurs="0"/>
                <xsd:element ref="aircraft_ref" minOccurs="0"/>
                <xsd:element ref="latitude" minOccurs="0"/>
                <xsd:element ref="longitude" minOccurs="0"/>
                <xsd:element ref="altitude_ft_msl" minOccurs="0"/>
                <xsd:element ref="sky_condition" minOccurs="0" maxOccurs="unbounded"/>
                <xsd:element ref="turbulence_condition" minOccurs="0" maxOccurs="unbounded"/>
                <xsd:element ref="icing_condition" minOccurs="0" maxOccurs="unbounded"/>
                <xsd:element ref="visibility_statute_mi" minOccurs="0"/>
                <xsd:element ref="wx_string" minOccurs="0"/>
                <xsd:element ref="temp_c" minOccurs="0"/>
                <xsd:element ref="wind_dir_degrees" minOccurs="0"/>
                <xsd:element ref="wind_speed_kt" minOccurs="0"/>
                <xsd:element ref="vert_gust_kt" minOccurs="0"/>
                <xsd:element ref="report_type" minOccurs="0"/>
                <xsd:element ref="raw_text" minOccurs="0"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="receipt_time" type="xsd:string">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                The time the observation was received (ISO 8601 date format)
                ex: 2023-11-09T01:40:11Z
            </xsd:documentation>
        </xsd:annotation>
    </xsd:element>
    <xsd:element name="observation_time" type="xsd:string">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                The observation time (ISO 8601 date format)
                ex: 2023-11-09T01:29:00Z
            </xsd:documentation>
        </xsd:annotation>
    </xsd:element>
    <xsd:element name="quality_control_flags">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element ref="mid_point_assumed" minOccurs="0" maxOccurs="1"/>
                <xsd:element ref="no_time_stamp" minOccurs="0" maxOccurs="1"/>
                <xsd:element ref="flt_lvl_range" minOccurs="0" maxOccurs="1"/>
                <xsd:element ref="above_ground_level_indicated" minOccurs="0" maxOccurs="1"/>
                <xsd:element ref="no_flt_lvl" minOccurs="0" maxOccurs="1"/>
                <xsd:element ref="bad_location" minOccurs="0" maxOccurs="1"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="mid_point_assumed" type="xsd:string"/>
    <xsd:element name="no_time_stamp" type="xsd:string"/>
    <xsd:element name="flt_lvl_range" type="xsd:string"/>
    <xsd:element name="above_ground_level_indicated" type="xsd:string"/>
    <xsd:element name="no_flt_lvl" type="xsd:string"/>
    <xsd:element name="bad_location" type="xsd:string"/>
    <xsd:element name="aircraft_ref" type="xsd:string"/>
    <xsd:element name="latitude" type="xsd:float"/>
    <xsd:element name="longitude" type="xsd:float"/>
    <xsd:element name="altitude_ft_msl" type="xsd:int"/>
    <xsd:element name="sky_condition">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                sky_cover - ex: "",VMC,VFR,SKC,CLR,CAVOK,FEW,SCT,BKN,OVC,OVX,IFR,IMC
            </xsd:documentation>
        </xsd:annotation>
        <xsd:complexType>
            <xsd:attribute name="sky_cover" type="xsd:string" />
            <xsd:attribute name="cloud_base_ft_msl" type="xsd:int"/>
            <xsd:attribute name="cloud_top_ft_msl" type="xsd:int"/>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="turbulence_condition">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                turbulence_intensity - ex: "",CAT,CHOP,LLWS,MWAVE
                turbulence_type - ex: "",NEG,SMTH-LGT,LGT,LGT-MOD,MOD,MOD-SEV,SEV,MOD-EXTM,SEV-EXTM,EXTM
                turbulence_freq - ex: "",ISOL,OCNL,CONT
            </xsd:documentation>
        </xsd:annotation>
        <xsd:complexType>
            <xsd:attribute name="turbulence_type" type="xsd:string"/>
            <xsd:attribute name="turbulence_intensity" type="xsd:string"/>
            <xsd:attribute name="turbulence_base_ft_msl" type="xsd:int"/>
            <xsd:attribute name="turbulence_top_ft_msl" type="xsd:int"/>
            <xsd:attribute name="turbulence_freq" type="xsd:string"/>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="icing_condition">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                icing_type - ex: "",RIME,CLEAR,MIXED
                icing_intensity - ex: "",NEG,NEGclr,TRC,TRC-LGT,LGT,LGT-MOD,MOD,MOD-SEV,HVY,SEV
            </xsd:documentation>
        </xsd:annotation>
        <xsd:complexType >
            <xsd:attribute name="icing_type" type="xsd:string"/>
            <xsd:attribute name="icing_intensity" type="xsd:string"/>
            <xsd:attribute name="icing_base_ft_msl" type="xsd:int"/>
            <xsd:attribute name="icing_top_ft_msl" type="xsd:int"/>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="visibility_statute_mi" type="xsd:int"/>
    <xsd:element name="wx_string" type="xsd:string"/>
    <xsd:element name="temp_c" type="xsd:float"/>
    <xsd:element name="wind_dir_degrees" type="xsd:int"/>
    <xsd:element name="wind_speed_kt" type="xsd:int"/>
    <xsd:element name="vert_gust_kt" type="xsd:int"/>
    <xsd:element name="report_type" type="xsd:string">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                Report type
                ex: PIREP,Urgent PIREP,AIREP,AMDAR
            </xsd:documentation>
        </xsd:annotation>
    </xsd:element>
    <xsd:element name="raw_text" type="xsd:string">
        <xsd:annotation>
            <xsd:documentation xml:lang="en">
                Raw text of observation
                ex: COU UA /OV COU260020/TM 0012/FL140/TP E170/TB LGT-MOD CHOP 140-170/RM DURC /ZKC FDC/CW
            </xsd:documentation>
        </xsd:annotation>
    </xsd:element>
</xsd:schema>