[OpenLayers-Users] Extract Attributes from KML or GML Files

[Christian Ledermann]

I think you already answered this but just to be  sure

untyped data like:

<ExtendedData>
  <Data name="string">
    <displayName>...</displayName>    <!-- string -->
    <value>...</value>                <!-- string -->
  </Data>
</ExtendedData>

cannot be extracted, it must be typed data like:

<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
  <name>ExtendedData+SchemaData</name>
  <open>1</open>

  <!-- Declare the type "TrailHeadType" with 3 fields -->
  *<Schema name="TrailHeadType" id="TrailHeadTypeId">*
    <SimpleField type="string" name="TrailHeadName">
      <displayName><![CDATA[<b>Trail Head Name</b>]]></displayName>
    </SimpleField>
    <SimpleField type="double" name="TrailLength">
      <displayName><![CDATA[<i>Length in miles</i>]]></displayName>
    </SimpleField>
    <SimpleField type="int" name="ElevationGain">
      <displayName><![CDATA[<i>Change in altitude</i>]]></displayName>
    </SimpleField>
  *</Schema> *

<!-- This is analogous to adding three fields to a new element of type
TrailHead:

  <TrailHeadType>
    <TrailHeadName>...</TrailHeadName>
    <TrailLength>...</TrailLength>
    <ElevationGain>...</ElevationGain>
 </TrailHeadType>
-->

  <!-- Instantiate some Placemarks extended with TrailHeadType fields -->
  <Placemark>
    <name>Easy trail</name>
    <ExtendedData>
      *<SchemaData schemaUrl="#TrailHeadTypeId">  *
        <SimpleData name="TrailHeadName">Pi in the sky</SimpleData>
        <SimpleData name="TrailLength">3.14159</SimpleData>
        <SimpleData name="ElevationGain">10</SimpleData>
      *</SchemaData> *
    </ExtendedData>
    <Point>
      <coordinates>-122.000,37.002</coordinates>
    </Point>
  </Placemark>
  <Placemark>
    <name>Difficult trail</name>
    <ExtendedData>
      *<SchemaData schemaUrl="#TrailHeadTypeId">  *
        <SimpleData name="TrailHeadName">Mount Everest</SimpleData>
        <SimpleData name="TrailLength">347.45</SimpleData>
        <SimpleData name="ElevationGain">10000</SimpleData>
      *</SchemaData>*
    </ExtendedData>
    <Point>
      <coordinates>-121.998,37.0078</coordinates>
    </Point>
  </Placemark>
</Document>
</kml>



On Fri, Nov 9, 2012 at 5:39 AM, Phil Scadden <p.scadden at gns.cri.nz> wrote:

> I read and display the features ok either from a KML or GML file, but
> can not extract the attributes.
> >
> > I use
> >
> > extractattribues: true
>
> Hopefully that is actually extractAttributes:true (case matters)
> Not every KML has attributes that are extractable. If it has
> <Schema>...</Schema> tag in the document headers and <SchemaData> in the
> features, then, yes. However, if "attributes" are just table entries in
> description, the no.
>
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-- 
Best Regards,

Christian Ledermann

Nairobi - Kenya
Mobile : +254 702978914

<*)))>{

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