<?xml version="1.0" encoding="UTF-8"?>
<!-- gpx_overlay.xsd version 0.3: Public GPX extensions for labels and polygon overlays -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:gpx_style="http://www.topografix.com/GPX/gpx_style/0/2" xmlns="http://www.topografix.com/GPX/gpx_overlay/0/3" targetNamespace="http://www.topografix.com/GPX/gpx_overlay/0/3" elementFormDefault="qualified">
<xsd:import namespace="http://www.topografix.com/GPX/gpx_style/0/2" schemaLocation="http://www.topografix.com/GPX/gpx_style/0/2/gpx_style.xsd"/>

<xsd:element name="label" type="labelType">
  <xsd:annotation>
   <xsd:documentation>
	Text overlay (waypoint or route map label, e.g.)
   </xsd:documentation>
  </xsd:annotation>
</xsd:element>

<xsd:element name="polyline" type="polylineType">
  <xsd:annotation>
   <xsd:documentation>
	Set of points describing a filled shape or line (map drawing, etc)
   </xsd:documentation>
  </xsd:annotation>
</xsd:element>

<xsd:element name="points" type="pointsType">
  <xsd:annotation>
   <xsd:documentation>
	List of points
   </xsd:documentation>
  </xsd:annotation>
</xsd:element>

<xsd:element name="pt" type="ptType">
  <xsd:annotation>
   <xsd:documentation>
	lat/lon/ele/timestamp point
   </xsd:documentation>
  </xsd:annotation>
</xsd:element>

<xsd:element name="max_scale" type="xsd:decimal">
  <xsd:annotation>
   <xsd:documentation>
	 Maximum scale at which the parent object is displayed on a map.  "24000" for a 1:24000 scale USGS topo, e.g.
   </xsd:documentation>
  </xsd:annotation>
</xsd:element>

<!-- label definition -->
    <xsd:complexType name="labelType">
     <xsd:annotation>
      <xsd:documentation>
		Text overlay (waypoint or route map label, e.g.)
	  </xsd:documentation>
	 </xsd:annotation>
	  <xsd:sequence>	<!-- elements must appear in this order -->
	  <!-- spatial elements -->
	    <xsd:choice minOccurs="0">
			<xsd:element name="point" type="ptType" minOccurs="0">
			 <xsd:annotation>
			  <xsd:documentation>
	  		   User-specified lat/lon position for the text label.
			  </xsd:documentation>
			 </xsd:annotation>
			</xsd:element>

			<xsd:element name="translate" type="xyOffsetType" minOccurs="0">
			 <xsd:annotation>
			  <xsd:documentation>
	  		   User-specified x/y offset for the text label.
			  </xsd:documentation>
			 </xsd:annotation>
			</xsd:element>
	    </xsd:choice>

	    <xsd:element name="rotate" type="degreesType" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   Rotation of text label.  Clockwise from 0 (default English text direction to the right)
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	    <xsd:element name="margin" type="xyOffsetType" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   Spacing from edge of parent object (waypoint symbol, track line) to label origin.  Explicit 0 centers label origin.
		   Sign of x,y margin implies horizontal and vertical alignment of text.
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	    <xsd:element name="label_text" type="xsd:string" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   The text string to display
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	    <xsd:element name="derived_from" type="xsd:string" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   Specifies that the text string in the overlay was derived from a GPX field or a calculated attribute of the parent.
		   "desc" means the text string came from the parent's desc field.  "area" signifies the text string is the calculated area
		   of the parent.
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

		<xsd:element name="type" type="xsd:string" minOccurs="0">
		 <xsd:annotation>
		  <xsd:documentation>
			Type (classification) of the text overlay.
		  </xsd:documentation>
		 </xsd:annotation>
		</xsd:element>

		<xsd:element ref="max_scale" minOccurs="0">
		  <xsd:annotation>
		   <xsd:documentation>
			 Maximum scale at which the parent object is displayed on a map.  "24000" for a 1:24000 scale USGS topo, e.g.
		   </xsd:documentation>
		  </xsd:annotation>
		</xsd:element>

	    <xsd:element ref="gpx_style:text" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   Text styling hints for the text overlay
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	    <xsd:element ref="gpx_style:line" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   styling hints for bounding box of the the text overlay
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	    <xsd:element ref="gpx_style:fill" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   styling hints for the background of the bounding box of the text overlay
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	    <xsd:element name="extensions" type="extensionsType" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   You can add extend GPX by adding your own elements from another schema here.
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>
	  </xsd:sequence>
    </xsd:complexType>

  <xsd:complexType name="polylineType">
    <xsd:annotation>
      <xsd:documentation>
		polyline represents an ordered list of points describing a closed or open shape.
	  </xsd:documentation>
	</xsd:annotation>
    <xsd:sequence>

      <xsd:element name="desc" type="xsd:string" minOccurs="0">
		<xsd:annotation>
		  <xsd:documentation>
			Description of polyline.
		  </xsd:documentation>
		</xsd:annotation>
	  </xsd:element>

	  <xsd:element name="type" type="xsd:string" minOccurs="0">
		<xsd:annotation>
		  <xsd:documentation>
			Type (classification) of polyline.
		  </xsd:documentation>
		</xsd:annotation>
	  </xsd:element>

		<xsd:element ref="max_scale" minOccurs="0">
		  <xsd:annotation>
		   <xsd:documentation>
			 Maximum scale at which the parent object is displayed on a map.  "24000" for a 1:24000 scale USGS topo, e.g.
		   </xsd:documentation>
		  </xsd:annotation>
		</xsd:element>

		<xsd:element ref="label" minOccurs="0">
		  <xsd:annotation>
		   <xsd:documentation>
			Map label for polyline
		   </xsd:documentation>
		  </xsd:annotation>
		</xsd:element>

	    <xsd:element ref="gpx_style:line" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   polyline line style
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	    <xsd:element ref="gpx_style:fill" minOccurs="0">
	     <xsd:annotation>
	      <xsd:documentation>
	  	   polyline fill style
	      </xsd:documentation>
	     </xsd:annotation>
		</xsd:element>

	 <xsd:element name="extensions" type="extensionsType" minOccurs="0">
      <xsd:annotation>
       <xsd:documentation>
		You can add extend GPX by adding your own elements from another schema here.
	   </xsd:documentation>
	  </xsd:annotation>
	 </xsd:element>

     <xsd:element name="points" type="pointsType" minOccurs="0" maxOccurs="unbounded">
      <xsd:annotation>
       <xsd:documentation>
		A segment of connected pt elements.  Analogous to trkseg.
	   </xsd:documentation>
	  </xsd:annotation>
	 </xsd:element>
  
    </xsd:sequence>
  </xsd:complexType>

  <xsd:complexType name="ptType">
   <xsd:annotation>
    <xsd:documentation>
	 A geographic point with optional elevation and time.  Available for use by other schemas.
    </xsd:documentation>
   </xsd:annotation>
   <xsd:sequence>	<!-- elements must appear in this order -->
    <xsd:element name="ele" type="xsd:decimal" minOccurs="0">
	 <xsd:annotation>
	  <xsd:documentation>
		The elevation (in meters) of the point.
	  </xsd:documentation>
	 </xsd:annotation>
	</xsd:element>
    <xsd:element name="time" type="xsd:dateTime" minOccurs="0">
	 <xsd:annotation>
	  <xsd:documentation>
		The time that the point was recorded.
	  </xsd:documentation>
	 </xsd:annotation>
	</xsd:element>
   </xsd:sequence>
    <xsd:attribute name="lat" type="latitudeType" use="required">
	 <xsd:annotation>
	  <xsd:documentation>
		The latitude of the point.  Decimal degrees, WGS84 datum.
	  </xsd:documentation>
	 </xsd:annotation>
	</xsd:attribute>
    <xsd:attribute name="lon" type="longitudeType" use="required">
	 <xsd:annotation>
	  <xsd:documentation>
		The latitude of the point.  Decimal degrees, WGS84 datum.
	  </xsd:documentation>
	 </xsd:annotation>
	</xsd:attribute>
  </xsd:complexType>

  <xsd:complexType name="pointsType">
   <xsd:annotation>
    <xsd:documentation>
	 An ordered sequence of points.
    </xsd:documentation>
   </xsd:annotation>
   <xsd:sequence>	<!-- elements must appear in this order -->
	 <xsd:element name="pt" type="ptType" minOccurs="0" maxOccurs="unbounded">
	   <xsd:annotation>
		<xsd:documentation>
		 Ordered list of geographic points.
		</xsd:documentation>
	   </xsd:annotation>
	 </xsd:element>
   </xsd:sequence>
  </xsd:complexType>

  <xsd:complexType name="xyOffsetType">
   <xsd:annotation>
    <xsd:documentation>
	 Offset in x,y dimensions (screen or printed page).  Units in millimeters.
    </xsd:documentation>
   </xsd:annotation>
    <xsd:attribute name="dx" type="xsd:decimal" use="required">
	 <xsd:annotation>
	  <xsd:documentation>
		Horizontal offset.
	  </xsd:documentation>
	 </xsd:annotation>
	</xsd:attribute>
    <xsd:attribute name="dy" type="xsd:decimal" use="required">
	 <xsd:annotation>
	  <xsd:documentation>
		Vertical offset.
	  </xsd:documentation>
	 </xsd:annotation>
	</xsd:attribute>
  </xsd:complexType>

  <xsd:simpleType name="latitudeType">
	 <xsd:annotation>
	  <xsd:documentation>
		The latitude of the point.  Decimal degrees, WGS84 datum.
	  </xsd:documentation>
	 </xsd:annotation>
    <xsd:restriction base="xsd:decimal">
      <xsd:minInclusive value="-90.0"/>
      <xsd:maxInclusive value="90.0"/>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:simpleType name="longitudeType">
	 <xsd:annotation>
	  <xsd:documentation>
		The longitude of the point.  Decimal degrees, WGS84 datum.
	  </xsd:documentation>
	 </xsd:annotation>
    <xsd:restriction base="xsd:decimal">
      <xsd:minInclusive value="-180.0"/>
      <xsd:maxExclusive value="180.0"/>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:simpleType name="degreesType">
	 <xsd:annotation>
	  <xsd:documentation>
		Used for bearing, heading, course.  Units are decimal degrees, true (not magnetic).
	  </xsd:documentation>
	 </xsd:annotation>
    <xsd:restriction base="xsd:decimal">
      <xsd:minInclusive value="0.0"/>
      <xsd:maxExclusive value="360.0"/>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:complexType name="extensionsType">
   <xsd:annotation>
    <xsd:documentation>
	 You can add extend GPX by adding your own elements from another schema here.
    </xsd:documentation>
   </xsd:annotation>
    <xsd:sequence>
	 <xsd:any namespace="##other" processContents="strict" minOccurs="0" maxOccurs="unbounded">
	   <xsd:annotation>
		<xsd:documentation>
		 You can add extend GPX by adding your own elements from another schema here.
		</xsd:documentation>
	   </xsd:annotation>
	 </xsd:any>
    </xsd:sequence>
  </xsd:complexType>

</xsd:schema>