Web Cartography 10

GML

  • XML based language
  • designed for spatial data
  • human readable

XML primer

<?xml version="1.0" encoding="utf-8"?>
<classroom id="Z1"> <!-- main element -->
    <equipment> <!-- subelement - complex type -->
        <desks>
            <desk color="brown" width="90" length="90" height="90"> <!-- attributes -->
            </desk>
        </desks>
        <chairs>
            <chair color="blue" hasWheels="true">
            </chair>
        </chairs>
        <computers>
            <computer>
                <os>Windows 7</os><!--  subelement simple types -->
                <hdd>
                    <size>500</size>
                    <type>ssd</type>
                </hdd>
            </computer>
        </computers>
    </equipment>
</classroom>

XML primer

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">
            Classroom schema for web cartography.
            @author Michal Zimmermann
        </xsd:documentation>
    </xsd:annotation>

    <xsd:element name="classroom" type="ClassroomType"/>
    <xsd:element name="equipment" type="EquipmentType"/>
    <xsd:element name="desks" type="DesksType"/>
    <xsd:element name="chairs" type="ChairsType"/>
    <xsd:element name="computers" type="ComputersType"/>

    <xsd:complexType name="ClassroomType">
        <xsd:sequence>
            <xsd:element name="equipment" type="EquipmentType"/>
        </xsd:sequence>
        <xsd:attribute name="id" type="xsd:string"/>
    </xsd:complexType>

    <xsd:complexType name="EquipmentType">
        <xsd:sequence>
            <xsd:element name="desks" minOccurs="1" maxOccurs="1">
            </xsd:element>
            <xsd:element name="chairs" minOccurs="1" maxOccurs="1">
            </xsd:element>
            <xsd:element name="computers" minOccurs="1" maxOccurs="1">
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>

    <xsd:complexType name="DesksType">
        <xsd:sequence>
            <xsd:element name="desk" minOccurs="0" maxOccurs="unbounded">
                <xsd:complexType>
                    <xsd:attribute name="color" type="xsd:string"/>
                    <xsd:attribute name="width" type="xsd:integer"/>
                    <xsd:attribute name="length" type="xsd:integer"/>
                    <xsd:attribute name="height" type="xsd:integer"/>
                </xsd:complexType>
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>

    <xsd:complexType name="ChairsType">
        <xsd:sequence>
            <xsd:element name="chair" minOccurs="0" maxOccurs="unbounded">
                <xsd:complexType>
                    <xsd:attribute name="color" type="xsd:string"/>
                    <xsd:attribute name="hasWheels" type="xsd:boolean"/>
                </xsd:complexType>
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>

    <xsd:complexType name="ComputersType">
        <xsd:sequence>
            <xsd:element name="computer" minOccurs="0" maxOccurs="unbounded">
                <xsd:complexType>
                    <xsd:sequence>
                        <xsd:element name="os" minOccurs="1" maxOccurs="1" type="xsd:string"/>
                        <xsd:element name="hdd" minOccurs="1" maxOccurs="unbounded">
                            <xsd:complexType>
                                <xsd:sequence>
                                    <xsd:element name="size" minOccurs="1" maxOccurs="1" type="xsd:positiveInteger"/>
                                    <xsd:element name="type" minOccurs="1" maxOccurs="1" type="xsd:string"/>
                                </xsd:sequence>
                            </xsd:complexType>
                        </xsd:element>
                    </xsd:sequence>
                </xsd:complexType>
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>
</xsd:schema>

XML primer

<?xml version="1.0" encoding="utf-8"?>
<cr:classroom id="Z1" xmlns:cr="http://www.example.com/CR"> <!-- main element -->
    <equipment> <!-- subelement - complex type -->
        <desks>
            <desk color="brown" width="90" length="90" height="90"> <!-- attributes -->
            </desk>
        </desks>
        <chairs>
            <chair color="blue" hasWheels="true">
            </chair>
        </chairs>
        <computers>
            <computer>
                <os>Windows 7</os><!--  subelement simple types -->
                <hdd>
                    <size>500</size>
                    <type>ssd</type>
                </hdd>
            </computer>
        </computers>
    </equipment>
</cr:classroom>

XML primer

<schema xmlns="http://www.w3.org/2001/XMLSchema"
    xmlns:cr="http://www.example.com/CR"
    targetNamespace="http://www.example.com/CR"
    >
    <annotation>
        <documentation xml:lang="en">
            Classroom schema for web cartography.
            @author Michal Zimmermann
        </documentation>
    </annotation>

    <element name="classroom" type="cr:ClassroomType"/>
    <element name="equipment" type="cr:EquipmentType"/>
    <element name="desks" type="cr:DesksType"/>
    <element name="chairs" type="cr:ChairsType"/>
    <element name="computers" type="cr:ComputersType"/>

    <complexType name="ClassroomType">
        <sequence>
            <element name="equipment" type="cr:EquipmentType"/>
        </sequence>
        <attribute name="id" type="string"/>
    </complexType>

    <complexType name="EquipmentType">
        <sequence>
            <element name="desks" minOccurs="1" maxOccurs="1">
            </element>
            <element name="chairs" minOccurs="1" maxOccurs="1">
            </element>
            <element name="computers" minOccurs="1" maxOccurs="1">
            </element>
        </sequence>
    </complexType>

    <complexType name="DesksType">
        <sequence>
            <element name="desk" minOccurs="0" maxOccurs="unbounded">
                <complexType>
                    <attribute name="color" type="string"/>
                    <attribute name="width" type="integer"/>
                    <attribute name="length" type="integer"/>
                    <attribute name="height" type="integer"/>
                </complexType>
            </element>
        </sequence>
    </complexType>

    <complexType name="ChairsType">
        <sequence>
            <element name="chair" minOccurs="0" maxOccurs="unbounded">
                <complexType>
                    <attribute name="color" type="string"/>
                    <attribute name="hasWheels" type="boolean"/>
                </complexType>
            </element>
        </sequence>
    </complexType>

    <complexType name="ComputersType">
        <sequence>
            <element name="computer" minOccurs="0" maxOccurs="unbounded">
                <complexType>
                    <sequence>
                        <element name="os" minOccurs="1" maxOccurs="1" type="string"/>
                        <element name="hdd" minOccurs="1" maxOccurs="unbounded">
                            <complexType>
                                <sequence>
                                    <element name="size" minOccurs="1" maxOccurs="1" type="positiveInteger"/>
                                    <element name="type" minOccurs="1" maxOccurs="1" type="string"/>
                                </sequence>
                            </complexType>
                        </element>
                    </sequence>
                </complexType>
            </element>
        </sequence>
    </complexType>
</schema>

GML primer

<?xml version="1.0" encoding="utf-8" ?>
<ogr:FeatureCollection
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation=""
     xmlns:ogr="http://ogr.maptools.org/"
     xmlns:gml="http://www.opengis.net/gml">
  <gml:boundedBy>
    <gml:Box>
      <gml:coord><gml:X>-25.00405092592593</gml:X><gml:Y>10.90234375</gml:Y></gml:coord>
      <gml:coord><gml:X>-25.00405092592593</gml:X><gml:Y>10.90234375</gml:Y></gml:coord>
    </gml:Box>
  </gml:boundedBy>

  <gml:featureMember>
    <ogr:test fid="test.0">
      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>-25.004050925925931,10.90234375</gml:coordinates></gml:Point></ogr:geometryProperty>
      <ogr:id>1</ogr:id>
    </ogr:test>
  </gml:featureMember>
  <gml:featureMember>
    <ogr:test fid="test.1">
      <ogr:geometryProperty><gml:Point srsName="EPSG:4326"><gml:coordinates>-26.004050925925931,10.90234375</gml:coordinates></gml:Point></ogr:geometryProperty>
      <ogr:id>1</ogr:id>
    </ogr:test>
  </gml:featureMember>
  <gml:featureMember>
    <ogr:test fid="test.2">
      <ogr:geometryProperty>
        <gml:Polygon>
         <gml:outerBoundaryIs>
                 <gml:LinearRing>
                         <gml:coordinates>0,0 100,0 100,100 0,100 0,0</gml:coordinates>
                 </gml:LinearRing>
        </gml:outerBoundaryIs>
        </gml:Polygon>
      </ogr:geometryProperty>
      <ogr:id>1</ogr:id>
    </ogr:test>
  </gml:featureMember>
</ogr:FeatureCollection>

Web Cartography 10: GML

By Michal Zimmermann

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Web Cartography 10: GML

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