modifications to fdsn-station-1.0.xsd for generating a useful full random stationXML file

fdsn station xml xsd modifications

--- fdsn-station-1.0.xsd	2013-11-23 16:55:41.423403285 +0100
+++ /home/megies/git/obspy/obspy/station/docs/fdsn-station-1.0.xsd	2013-11-23 16:42:05.043582600 +0100
@@ -60,19 +60,19 @@
 						message.</xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="Sender" type="xs:string" minOccurs="1">
+			<xs:element name="Sender" type="xs:string" minOccurs="0">
 				<xs:annotation>
 					<xs:documentation>Name of the institution sending this
 						message.</xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="Module" type="xs:string" minOccurs="1">
+			<xs:element name="Module" type="xs:string" minOccurs="0">
 				<xs:annotation>
 					<xs:documentation>Name of the software module that generated this document.
 					</xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="ModuleURI" type="xs:anyURI" minOccurs="1">
+			<xs:element name="ModuleURI" type="xs:anyURI" minOccurs="0">
 				<xs:annotation>
 					<xs:documentation> This is the address of the query that generated the document,
 						or, if applicable, the address of the software that generated this document.
@@ -101,14 +101,14 @@
 		<xs:complexContent>
 			<xs:extension base="fsx:BaseNodeType">
 				<xs:sequence>
-					<xs:element name="TotalNumberStations" type="fsx:CounterType" minOccurs="1">
+					<xs:element name="TotalNumberStations" type="fsx:CounterType" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation> The total number of stations contained in this
 								network, including inactive or terminated stations.
 							</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="SelectedNumberStations" type="fsx:CounterType" minOccurs="1">
+					<xs:element name="SelectedNumberStations" type="fsx:CounterType" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation> The total number of stations in this network that
 								were selected by the query that produced this document, even if the
@@ -117,7 +117,7 @@
 								the Network level.) </xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Station" type="fsx:StationType" minOccurs="1" maxOccurs="unbounded"/>
+					<xs:element name="Station" type="fsx:StationType" minOccurs="0" maxOccurs="unbounded"/>
 				</xs:sequence>
 			</xs:extension>
 		</xs:complexContent>
@@ -141,25 +141,25 @@
 								etc.).</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Vault" type="xs:string" minOccurs="1">
+					<xs:element name="Vault" type="xs:string" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>Type of vault, e.g. WWSSN, tunnel, transportable
 								array, etc.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Geology" type="xs:string" minOccurs="1">
+					<xs:element name="Geology" type="xs:string" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>Type of rock and/or geologic
 								formation.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Equipment" type="fsx:EquipmentType" minOccurs="1" maxOccurs="unbounded">
+					<xs:element name="Equipment" type="fsx:EquipmentType" minOccurs="0" maxOccurs="unbounded">
 						<xs:annotation>
 							<xs:documentation>Equipment used by all channels at a
 								station.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Operator" minOccurs="1" maxOccurs="unbounded">
+					<xs:element name="Operator" minOccurs="0" maxOccurs="unbounded">
 						<xs:annotation>
 							<xs:documentation>An operating agency and associated contact persons. If
 								there multiple operators, each one should be encapsulated within an
@@ -170,8 +170,8 @@
 						<xs:complexType>
 							<xs:sequence>
 								<xs:element name="Agency" type="xs:string" maxOccurs="unbounded"/>
-								<xs:element name="Contact" type="fsx:PersonType" minOccurs="1" maxOccurs="unbounded"/>
-								<xs:element name="WebSite" type="xs:anyURI" minOccurs="1"/>
+								<xs:element name="Contact" type="fsx:PersonType" minOccurs="0" maxOccurs="unbounded"/>
+								<xs:element name="WebSite" type="xs:anyURI" minOccurs="0"/>
 							</xs:sequence>
 						</xs:complexType>
 					</xs:element>
@@ -181,33 +181,33 @@
 								installed.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="TerminationDate" type="xs:dateTime" minOccurs="1">
+					<xs:element name="TerminationDate" type="xs:dateTime" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>Date and time (UTC) when the station was terminated or
 								will be terminated. A blank value should be assumed to mean that the
 								station is still active.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="TotalNumberChannels" type="fsx:CounterType" minOccurs="1">
+					<xs:element name="TotalNumberChannels" type="fsx:CounterType" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>Total number of channels recorded at this
 								station.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="SelectedNumberChannels" type="fsx:CounterType" minOccurs="1">
+					<xs:element name="SelectedNumberChannels" type="fsx:CounterType" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>Number of channels recorded at this station and
 								selected by the query that produced this
 								document.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="ExternalReference" type="fsx:ExternalReferenceType" minOccurs="1" maxOccurs="unbounded">
+					<xs:element name="ExternalReference" type="fsx:ExternalReferenceType" minOccurs="0" maxOccurs="unbounded">
 						<xs:annotation>
 							<xs:documentation>URI of any type of external report, such as IRIS data
 								reports or dataless SEED volumes.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Channel" type="fsx:ChannelType" minOccurs="1" maxOccurs="unbounded"/>
+					<xs:element name="Channel" type="fsx:ChannelType" minOccurs="0" maxOccurs="unbounded"/>
 				</xs:sequence>
 			</xs:extension>
 		</xs:complexContent>
@@ -221,7 +221,7 @@
 		<xs:complexContent>
 			<xs:extension base="fsx:BaseNodeType">
 				<xs:sequence>
-					<xs:element name="ExternalReference" type="fsx:ExternalReferenceType" minOccurs="1" maxOccurs="unbounded">
+					<xs:element name="ExternalReference" type="fsx:ExternalReferenceType" minOccurs="0" maxOccurs="unbounded">
 						<xs:annotation>
 							<xs:documentation>URI of any type of external report, such as data
 								quality reports.</xs:documentation>
@@ -253,19 +253,19 @@
 								above.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Azimuth" type="fsx:AzimuthType" minOccurs="1">
+					<xs:element name="Azimuth" type="fsx:AzimuthType" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>Azimuth of the sensor in degrees from north,
 								clockwise.</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Dip" type="fsx:DipType" minOccurs="1">
+					<xs:element name="Dip" type="fsx:DipType" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>Dip of the instrument in degrees, down from
 								horizontal</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="Type" minOccurs="1" maxOccurs="unbounded">
+					<xs:element name="Type" minOccurs="0" maxOccurs="unbounded">
 						<xs:annotation>
 							<xs:documentation>The type of data this channel collects. Corresponds to
 								channel flags in SEED blockette 52. The SEED volume producer could
@@ -288,14 +288,14 @@
 							</xs:restriction>
 						</xs:simpleType>
 					</xs:element>
-					<xs:group ref="fsx:SampleRateGroup" minOccurs="1"/>
-					<xs:element name="StorageFormat" type="xs:string" minOccurs="1">
+					<xs:group ref="fsx:SampleRateGroup" minOccurs="0"/>
+					<xs:element name="StorageFormat" type="xs:string" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>The storage format of the recorded data (e.g.
 								SEED).</xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:element name="ClockDrift" minOccurs="1">
+					<xs:element name="ClockDrift" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>A tolerance value, measured in seconds per sample,
 								used as a threshold for time error detection in data from the
@@ -310,12 +310,12 @@
 							</xs:simpleContent>
 						</xs:complexType>
 					</xs:element>
-					<xs:element name="CalibrationUnits" type="fsx:UnitsType" minOccurs="1"/>
-					<xs:element name="Sensor" type="fsx:EquipmentType" minOccurs="1"/>
-					<xs:element name="PreAmplifier" type="fsx:EquipmentType" minOccurs="1"/>
-					<xs:element name="DataLogger" type="fsx:EquipmentType" minOccurs="1"/>
-					<xs:element name="Equipment" type="fsx:EquipmentType" minOccurs="1"/>
-					<xs:element name="Response" type="fsx:ResponseType" minOccurs="1"/>
+					<xs:element name="CalibrationUnits" type="fsx:UnitsType" minOccurs="0"/>
+					<xs:element name="Sensor" type="fsx:EquipmentType" minOccurs="0"/>
+					<xs:element name="PreAmplifier" type="fsx:EquipmentType" minOccurs="0"/>
+					<xs:element name="DataLogger" type="fsx:EquipmentType" minOccurs="0"/>
+					<xs:element name="Equipment" type="fsx:EquipmentType" minOccurs="0"/>
+					<xs:element name="Response" type="fsx:ResponseType" minOccurs="0"/>
 				</xs:sequence>
 				<xs:attribute name="locationCode" type="xs:string" use="required"/>
 			</xs:extension>
@@ -381,7 +381,7 @@
 								correcting for this response. </xs:documentation>
 						</xs:annotation>
 					</xs:element>
-					<xs:group ref="fsx:FrequencyRangeGroup" minOccurs="1">
+					<xs:group ref="fsx:FrequencyRangeGroup" minOccurs="0">
 						<xs:annotation>
 							<xs:documentation>The frequency range for which the SensitivityValue is
 								valid within the dB variation specified.</xs:documentation>
@@ -393,15 +393,15 @@
 	</xs:complexType>
 	<xs:complexType name="EquipmentType">
 		<xs:sequence>
-			<xs:element name="Type" type="xs:string" minOccurs="1"/>
-			<xs:element name="Description" type="xs:string" minOccurs="1"/>
-			<xs:element name="Manufacturer" type="xs:string" minOccurs="1"/>
-			<xs:element name="Vendor" type="xs:string" minOccurs="1"/>
-			<xs:element name="Model" type="xs:string" minOccurs="1"/>
-			<xs:element name="SerialNumber" type="xs:string" minOccurs="1"/>
-			<xs:element name="InstallationDate" type="xs:dateTime" minOccurs="1"/>
-			<xs:element name="RemovalDate" type="xs:dateTime" minOccurs="1"/>
-			<xs:element name="CalibrationDate" type="xs:dateTime" minOccurs="1" maxOccurs="unbounded"/>
+			<xs:element name="Type" type="xs:string" minOccurs="0"/>
+			<xs:element name="Description" type="xs:string" minOccurs="0"/>
+			<xs:element name="Manufacturer" type="xs:string" minOccurs="0"/>
+			<xs:element name="Vendor" type="xs:string" minOccurs="0"/>
+			<xs:element name="Model" type="xs:string" minOccurs="0"/>
+			<xs:element name="SerialNumber" type="xs:string" minOccurs="0"/>
+			<xs:element name="InstallationDate" type="xs:dateTime" minOccurs="0"/>
+			<xs:element name="RemovalDate" type="xs:dateTime" minOccurs="0"/>
+			<xs:element name="CalibrationDate" type="xs:dateTime" minOccurs="0" maxOccurs="unbounded"/>
 			<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
 		</xs:sequence>
 		<xs:attribute name="resourceId" type="xs:string" use="optional">
@@ -433,7 +433,7 @@
 				<xs:element name="FIR" type="fsx:FIRType"/>
 				<xs:element name="Polynomial" type="fsx:PolynomialType"/>
 			</xs:choice>
-			<xs:element name="Decimation" type="fsx:DecimationType" minOccurs="1"/>
+			<xs:element name="Decimation" type="fsx:DecimationType" minOccurs="0"/>
 			<xs:element name="StageGain" type="fsx:GainType">
 				<xs:annotation>
 					<xs:documentation>StageSensitivity is the gain at the stage of the encapsulating
@@ -474,9 +474,9 @@
 		</xs:annotation>
 		<xs:sequence>
 			<xs:element name="Value" type="xs:string"/>
-			<xs:element name="BeginEffectiveTime" type="xs:dateTime" minOccurs="1"/>
-			<xs:element name="EndEffectiveTime" type="xs:dateTime" minOccurs="1"/>
-			<xs:element name="Author" type="fsx:PersonType" minOccurs="1" maxOccurs="unbounded"/>
+			<xs:element name="BeginEffectiveTime" type="xs:dateTime" minOccurs="0"/>
+			<xs:element name="EndEffectiveTime" type="xs:dateTime" minOccurs="0"/>
+			<xs:element name="Author" type="fsx:PersonType" minOccurs="0" maxOccurs="unbounded"/>
 		</xs:sequence>
 		<xs:attribute name="id" type="fsx:CounterType"/>
 	</xs:complexType>
@@ -499,8 +499,8 @@
 					</xs:element>
 					<xs:element name="NormalizationFactor" type="xs:double" default="1.0"/>
 					<xs:element name="NormalizationFrequency" type="fsx:FrequencyType"/>
-					<xs:element name="Zero" type="fsx:PoleZeroType" minOccurs="1" maxOccurs="unbounded"/>
-					<xs:element name="Pole" type="fsx:PoleZeroType" minOccurs="1" maxOccurs="unbounded"/>
+					<xs:element name="Zero" type="fsx:PoleZeroType" minOccurs="0" maxOccurs="unbounded"/>
+					<xs:element name="Pole" type="fsx:PoleZeroType" minOccurs="0" maxOccurs="unbounded"/>
 				</xs:sequence>
 			</xs:extension>
 		</xs:complexContent>
@@ -522,7 +522,7 @@
 							</xs:restriction>
 						</xs:simpleType>
 					</xs:element>
-					<xs:element name="NumeratorCoefficient" minOccurs="1" maxOccurs="unbounded">
+					<xs:element name="NumeratorCoefficient" minOccurs="0" maxOccurs="unbounded">
 						<xs:complexType>
 							<xs:simpleContent>
 								<xs:extension base="xs:double">
@@ -553,8 +553,8 @@
 							</xs:restriction>
 						</xs:simpleType>
 					</xs:element>
-					<xs:element name="Numerator" type="fsx:FloatType" minOccurs="1" maxOccurs="unbounded"/>
-					<xs:element name="Denominator" type="fsx:FloatType" minOccurs="1" maxOccurs="unbounded"/>
+					<xs:element name="Numerator" type="fsx:FloatType" minOccurs="0" maxOccurs="unbounded"/>
+					<xs:element name="Denominator" type="fsx:FloatType" minOccurs="0" maxOccurs="unbounded"/>
 				</xs:sequence>
 			</xs:extension>
 		</xs:complexContent>
@@ -574,7 +574,7 @@
 		<xs:complexContent>
 			<xs:extension base="fsx:BaseFilterType">
 				<xs:sequence>
-					<xs:element name="ResponseListElement" type="fsx:ResponseListElementType" minOccurs="1" maxOccurs="unbounded"/>
+					<xs:element name="ResponseListElement" type="fsx:ResponseListElementType" minOccurs="0" maxOccurs="unbounded"/>
 				</xs:sequence>
 			</xs:extension>
 		</xs:complexContent>
@@ -786,7 +786,7 @@
 		</xs:annotation>
 		<xs:sequence>
 			<xs:element name="SampleRate" type="fsx:SampleRateType"/>
-			<xs:element name="SampleRateRatio" type="fsx:SampleRateRatioType" minOccurs="1"/>
+			<xs:element name="SampleRateRatio" type="fsx:SampleRateRatioType" minOccurs="0"/>
 		</xs:sequence>
 	</xs:group>
 	<xs:complexType name="SampleRateType">
@@ -835,10 +835,10 @@
 				numbers.</xs:documentation>
 		</xs:annotation>
 		<xs:sequence>
-			<xs:element name="Name" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
-			<xs:element name="Agency" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
-			<xs:element name="Email" type="fsx:EmailType" minOccurs="1" maxOccurs="unbounded"/>
-			<xs:element name="Phone" type="fsx:PhoneNumberType" minOccurs="1" maxOccurs="unbounded"/>
+			<xs:element name="Name" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
+			<xs:element name="Agency" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
+			<xs:element name="Email" type="fsx:EmailType" minOccurs="0" maxOccurs="unbounded"/>
+			<xs:element name="Phone" type="fsx:PhoneNumberType" minOccurs="0" maxOccurs="unbounded"/>
 		</xs:sequence>
 	</xs:complexType>
 	<xs:complexType name="SiteType">
@@ -853,26 +853,26 @@
 						SEED blockette 50, field 9. </xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="Description" type="xs:string" minOccurs="1">
+			<xs:element name="Description" type="xs:string" minOccurs="0">
 				<xs:annotation>
 					<xs:documentation> A longer description of the location of this station, e.g.
 						"NW corner of Yellowstone National Park" or "20 miles west of Highway 40."
 					</xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="Town" type="xs:string" minOccurs="1">
+			<xs:element name="Town" type="xs:string" minOccurs="0">
 				<xs:annotation>
 					<xs:documentation> The town or city closest to the station.</xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="County" type="xs:string" minOccurs="1"/>
-			<xs:element name="Region" type="xs:string" minOccurs="1">
+			<xs:element name="County" type="xs:string" minOccurs="0"/>
+			<xs:element name="Region" type="xs:string" minOccurs="0">
 				<xs:annotation>
 					<xs:documentation> The state, province, or region of this
 						site.</xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="Country" type="xs:string" minOccurs="1"/>
+			<xs:element name="Country" type="xs:string" minOccurs="0"/>
 			<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
 		</xs:sequence>
 		<xs:anyAttribute namespace="##other" processContents="lax"/>
@@ -901,7 +901,7 @@
 	</xs:simpleType>
 	<xs:complexType name="PhoneNumberType">
 		<xs:sequence>
-			<xs:element name="CountryCode" type="xs:integer" minOccurs="1"/>
+			<xs:element name="CountryCode" type="xs:integer" minOccurs="0"/>
 			<xs:element name="AreaCode" type="xs:integer"/>
 			<xs:element name="PhoneNumber">
 				<xs:simpleType>
@@ -931,7 +931,7 @@
 					<xs:documentation>Name of units, e.g. "M/S", "V", "PA".</xs:documentation>
 				</xs:annotation>
 			</xs:element>
-			<xs:element name="Description" type="xs:string" minOccurs="1">
+			<xs:element name="Description" type="xs:string" minOccurs="0">
 				<xs:annotation>
 					<xs:documentation>Description of units, e.g. "Velocity in meters per second",
 						"Volts", "Pascals".</xs:documentation>
@@ -944,7 +944,7 @@
 			<xs:documentation> The BaseFilterType is derived by all filters. </xs:documentation>
 		</xs:annotation>
 		<xs:sequence>
-			<xs:element name="Description" type="xs:string" minOccurs="1"/>
+			<xs:element name="Description" type="xs:string" minOccurs="0"/>
 			<xs:element name="InputUnits" type="fsx:UnitsType">
 				<xs:annotation>
 					<xs:documentation> The units of the data as input from the perspective of data
@@ -975,14 +975,14 @@
 	</xs:complexType>
 	<xs:complexType name="ResponseType">
 		<xs:sequence>
-			<xs:choice minOccurs="1">
+			<xs:choice minOccurs="0">
 				<xs:annotation>
 					<xs:documentation>Instrument sensitivities, or the complete system sensitivity,
 						can be expressed using either a sensitivity value or a polynomial. The
 						information can be used to convert raw data to Earth at a specified
 						frequency or within a range of frequencies. </xs:documentation>
 				</xs:annotation>
-				<xs:element name="InstrumentSensitivity" type="fsx:SensitivityType">
+				<xs:element name="InstrumentSensitivity" type="fsx:SensitivityType" minOccurs="0">
 					<xs:annotation>
 						<xs:documentation> The total sensitivity for a channel, representing the
 							complete acquisition system expressed as a scalar. Equivalent to SEED
@@ -990,7 +990,7 @@
 							range. </xs:documentation>
 					</xs:annotation>
 				</xs:element>
-				<xs:element name="InstrumentPolynomial" type="fsx:PolynomialType">
+				<xs:element name="InstrumentPolynomial" type="fsx:PolynomialType" minOccurs="0">
 					<xs:annotation>
 						<xs:documentation> The total sensitivity for a channel, representing the
 							complete acquisition system expressed as a polynomial. Equivalent to
@@ -998,7 +998,7 @@
 					</xs:annotation>
 				</xs:element>
 			</xs:choice>
-			<xs:element name="Stage" type="fsx:ResponseStageType" minOccurs="1" maxOccurs="unbounded"/>
+			<xs:element name="Stage" type="fsx:ResponseStageType" minOccurs="0" maxOccurs="unbounded"/>
 			<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
 		</xs:sequence>
 		<xs:attribute name="resourceId" type="xs:string">
@@ -1014,8 +1014,8 @@
 				types.</xs:documentation>
 		</xs:annotation>
 		<xs:sequence>
-			<xs:element name="Description" type="xs:string" minOccurs="1"/>
-			<xs:element name="Comment" type="fsx:CommentType" minOccurs="1" maxOccurs="unbounded"/>
+			<xs:element name="Description" type="xs:string" minOccurs="0"/>
+			<xs:element name="Comment" type="fsx:CommentType" minOccurs="0" maxOccurs="unbounded"/>
 			<xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
 		</xs:sequence>
 		<xs:attribute name="code" type="xs:string" use="required"/>
@@ -1036,4 +1036,4 @@
 		</xs:attribute>
 		<xs:anyAttribute namespace="##other" processContents="lax"/>
 	</xs:complexType>
-</xs:schema>
\ No newline at end of file
+</xs:schema>