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<h1>OGRFeatureDefn Class Reference</h1><!-- doxytag: class="OGRFeatureDefn" -->
<p><code>#include <<a class="el" href="ogr__feature_8h_source.html">ogr_feature.h</a>></code></p>
<p><a href="classOGRFeatureDefn-members.html">List of all members.</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#ab98552e676127d847582778d70b7e27b">OGRFeatureDefn</a> (const char *pszName=NULL)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a1efe6db724bb1c5fde13e5f3896e4a01">GetName</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#ab400f9106e7544ebafa30b1fe59869b1">GetFieldCount</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a43b95ce699bbca73acb453cc959378e7">GetFieldDefn</a> (int i)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a4f7111e4c818f194932795e9c9593258">GetFieldIndex</a> (const char *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a40e681d8464b42f1a1fac655f16ac3dd">AddFieldDefn</a> (<a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="ogr__core_8h.html#a800236a0d460ef66e687b7b65610f12a">OGRwkbGeometryType</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a81a7dc7ed24fe9f2634bf447d1799e84">GetGeomType</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#aa0f50b39efbba6559a510d7afcfa5efb">SetGeomType</a> (<a class="el" href="ogr__core_8h.html#a800236a0d460ef66e687b7b65610f12a">OGRwkbGeometryType</a>)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#adbe115a21fb8d247f452ba9d7f00a400">Clone</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a2c58c6238242dff3d472faf5e3803922">Reference</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a87a280dd42634206dfbcfc47b1ecfea4">Dereference</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#af28dd34d8e3ceee1cb1ba6798711b4e1">GetReferenceCount</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classOGRFeatureDefn.html#a75e1424e3ce755d4393f5b42736d13ee">Release</a> ()</td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Definition of a feature class or feature layer.</p>
<p>This object contains schema information for a set of OGRFeatures. In table based systems, an <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> is essentially a layer. In more object oriented approaches (such as SF CORBA) this can represent a class of features but doesn't necessarily relate to all of a layer, or just one layer.</p>
<p>This object also can contain some other information such as a name, the base geometry type and potentially other metadata.</p>
<p>It is reasonable for different translators to derive classes from <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> with additional translator specific information. </p>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="ab98552e676127d847582778d70b7e27b"></a><!-- doxytag: member="OGRFeatureDefn::OGRFeatureDefn" ref="ab98552e676127d847582778d70b7e27b" args="(const char *pszName=NULL)" -->
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<td class="memname">OGRFeatureDefn::OGRFeatureDefn </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>pszName</em> = <code>NULL</code></td>
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<p>Constructor</p>
<p>The <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> maintains a reference count, but this starts at zero. It is mainly intended to represent a count of OGRFeature's based on this definition.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a5a8049bf2d58da5381c9350a6159ea6c">OGR_FD_Create()</a>.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>pszName</em> </td><td>the name to be assigned to this layer/class. It does not need to be unique. </td></tr>
</table>
</dd>
</dl>
<p>References <a class="el" href="ogr__core_8h_source.html#l00146">wkbUnknown</a>.</p>
<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00181">Clone()</a>.</p>
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<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a40e681d8464b42f1a1fac655f16ac3dd"></a><!-- doxytag: member="OGRFeatureDefn::AddFieldDefn" ref="a40e681d8464b42f1a1fac655f16ac3dd" args="(OGRFieldDefn *)" -->
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<td class="memname">void OGRFeatureDefn::AddFieldDefn </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> * </td>
<td class="paramname"> <em>poNewDefn</em></td>
<td> ) </td>
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<p>Add a new field definition.</p>
<p>This method should only be called while there are no <a class="el" href="classOGRFeature.html">OGRFeature</a> objects in existance based on this <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a>. The <a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> passed in is copied, and remains the responsibility of the caller.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a2a798e8d03299403418a7c87862f1acb">OGR_FD_AddFieldDefn()</a>.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>poNewDefn</em> </td><td>the definition of the new field. </td></tr>
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</dd>
</dl>
<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00181">Clone()</a>.</p>
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<a class="anchor" id="adbe115a21fb8d247f452ba9d7f00a400"></a><!-- doxytag: member="OGRFeatureDefn::Clone" ref="adbe115a21fb8d247f452ba9d7f00a400" args="()" -->
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<td class="memname"><a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a> * OGRFeatureDefn::Clone </td>
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<p>Create a copy of this feature definition.</p>
<p>Creates a deep copy of the feature definition.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>the copy. </dd></dl>
<p>References <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00328">AddFieldDefn()</a>, <a class="el" href="ogr__feature_8h_source.html#l00130">GetFieldCount()</a>, <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00277">GetFieldDefn()</a>, <a class="el" href="ogr__feature_8h_source.html#l00136">GetGeomType()</a>, <a class="el" href="ogr__feature_8h_source.html#l00128">GetName()</a>, <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00053">OGRFeatureDefn()</a>, and <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00418">SetGeomType()</a>.</p>
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<a class="anchor" id="a87a280dd42634206dfbcfc47b1ecfea4"></a><!-- doxytag: member="OGRFeatureDefn::Dereference" ref="a87a280dd42634206dfbcfc47b1ecfea4" args="()" -->
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<td class="memname">int OGRFeatureDefn::Dereference </td>
<td>(</td>
<td class="paramname"></td>
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<td><code> [inline]</code></td>
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<p>Decrements the reference count by one.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a107635936c90c7f4347d7b3f9fb06e6d">OGR_FD_Dereference()</a>.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>the updated reference count. </dd></dl>
<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00140">Release()</a>.</p>
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<a class="anchor" id="ab400f9106e7544ebafa30b1fe59869b1"></a><!-- doxytag: member="OGRFeatureDefn::GetFieldCount" ref="ab400f9106e7544ebafa30b1fe59869b1" args="()" -->
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<td class="memname">int OGRFeatureDefn::GetFieldCount </td>
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<td><code> [inline]</code></td>
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<p>Fetch number of fields on this feature.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a586a14271a457387a2b5c0097a02c8da">OGR_FD_GetFieldCount()</a>. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>count of fields. </dd></dl>
<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00181">Clone()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l00473">OGRFeature::Clone()</a>, <a class="el" href="ogrdatasource_8cpp_source.html#l00642">OGRDataSource::ExecuteSQL()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l00890">OGRFeature::GetFieldAsDouble()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l00805">OGRFeature::GetFieldAsInteger()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l00976">OGRFeature::GetFieldAsString()</a>, and <a class="el" href="ogrfeature_8cpp_source.html#l00054">OGRFeature::OGRFeature()</a>.</p>
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<a class="anchor" id="a43b95ce699bbca73acb453cc959378e7"></a><!-- doxytag: member="OGRFeatureDefn::GetFieldDefn" ref="a43b95ce699bbca73acb453cc959378e7" args="(int i)" -->
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<td class="memname"><a class="el" href="classOGRFieldDefn.html">OGRFieldDefn</a> * OGRFeatureDefn::GetFieldDefn </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>iField</em></td>
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<p>Fetch field definition.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a484456df86a01284769d0afe3beaa4f6">OGR_FD_GetFieldDefn()</a>.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>iField</em> </td><td>the field to fetch, between 0 and <a class="el" href="classOGRFeatureDefn.html#ab400f9106e7544ebafa30b1fe59869b1">GetFieldCount()</a>-1.</td></tr>
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</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>a pointer to an internal field definition object. This object should not be modified or freed by the application. </dd></dl>
<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00181">Clone()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l02413">OGRFeature::DumpReadable()</a>, <a class="el" href="ogrdatasource_8cpp_source.html#l00642">OGRDataSource::ExecuteSQL()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l01506">OGRFeature::GetFieldAsBinary()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l01582">OGRFeature::GetFieldAsDateTime()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l00890">OGRFeature::GetFieldAsDouble()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l01358">OGRFeature::GetFieldAsDoubleList()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l00805">OGRFeature::GetFieldAsInteger()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l01281">OGRFeature::GetFieldAsIntegerList()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l00976">OGRFeature::GetFieldAsString()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l01436">OGRFeature::GetFieldAsStringList()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l01682">OGRFeature::SetField()</a>, and <a class="el" href="ogrfeature_8cpp_source.html#l00689">OGRFeature::UnsetField()</a>.</p>
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<a class="anchor" id="a4f7111e4c818f194932795e9c9593258"></a><!-- doxytag: member="OGRFeatureDefn::GetFieldIndex" ref="a4f7111e4c818f194932795e9c9593258" args="(const char *)" -->
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<td class="memname">int OGRFeatureDefn::GetFieldIndex </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>pszFieldName</em></td>
<td> ) </td>
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<p>Find field by name.</p>
<p>The field index of the first field matching the passed field name (case insensitively) is returned.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a1e54c3271dce0562209d78ae6eaae330">OGR_FD_GetFieldIndex()</a>.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>pszFieldName</em> </td><td>the field name to search for.</td></tr>
</table>
</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>the field index, or -1 if no match found. </dd></dl>
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<a class="anchor" id="a81a7dc7ed24fe9f2634bf447d1799e84"></a><!-- doxytag: member="OGRFeatureDefn::GetGeomType" ref="a81a7dc7ed24fe9f2634bf447d1799e84" args="()" -->
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<td class="memname"><a class="el" href="ogr__core_8h.html#a800236a0d460ef66e687b7b65610f12a">OGRwkbGeometryType</a> OGRFeatureDefn::GetGeomType </td>
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<p>Fetch the geometry base type.</p>
<p>Note that some drivers are unable to determine a specific geometry type for a layer, in which case wkbUnknown is returned. A value of wkbNone indicates no geometry is available for the layer at all. Many drivers do not properly mark the geometry type as 25D even if some or all geometries are in fact 25D. A few (broken) drivers return wkbPolygon for layers that also include wkbMultiPolygon.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#add0b3a6b6062122e4f4316d194d2a1cf">OGR_FD_GetGeomType()</a>.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>the base type for all geometry related to this definition. </dd></dl>
<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00181">Clone()</a>.</p>
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<a class="anchor" id="a1efe6db724bb1c5fde13e5f3896e4a01"></a><!-- doxytag: member="OGRFeatureDefn::GetName" ref="a1efe6db724bb1c5fde13e5f3896e4a01" args="()" -->
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<td class="memname">const char * OGRFeatureDefn::GetName </td>
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<td><code> [inline]</code></td>
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<p>Get name of this <a class="el" href="classOGRFeatureDefn.html">OGRFeatureDefn</a>.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a20f309bf10e5b76cc083848b710babb8">OGR_FD_GetName()</a>.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>the name. This name is internal and should not be modified, or freed. </dd></dl>
<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00181">Clone()</a>, <a class="el" href="ogrfeature_8cpp_source.html#l02413">OGRFeature::DumpReadable()</a>, and <a class="el" href="ogrdatasource_8cpp_source.html#l00371">OGRDataSource::GetLayerByName()</a>.</p>
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<p>Fetch current reference count.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a9e4e8867edeaf1a6f98e6ff284835811">OGR_FD_GetReferenceCount()</a>.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>the current reference count. </dd></dl>
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<td class="memname">int OGRFeatureDefn::Reference </td>
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<p>Increments the reference count by one.</p>
<p>The reference count is used keep track of the number of <a class="el" href="classOGRFeature.html">OGRFeature</a> objects referencing this definition.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a6763104e7fafcab1b52d9b0f275e19e8">OGR_FD_Reference()</a>.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>the updated reference count. </dd></dl>
<p>Referenced by <a class="el" href="ogrfeature_8cpp_source.html#l00054">OGRFeature::OGRFeature()</a>.</p>
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<td class="memname">void OGRFeatureDefn::Release </td>
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<p>Drop a reference to this object, and destroy if no longer referenced. </p>
<p>References <a class="el" href="ogr__feature_8h_source.html#l00142">Dereference()</a>.</p>
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<a class="anchor" id="aa0f50b39efbba6559a510d7afcfa5efb"></a><!-- doxytag: member="OGRFeatureDefn::SetGeomType" ref="aa0f50b39efbba6559a510d7afcfa5efb" args="(OGRwkbGeometryType)" -->
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<td class="memname">void OGRFeatureDefn::SetGeomType </td>
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<td class="paramtype"><a class="el" href="ogr__core_8h.html#a800236a0d460ef66e687b7b65610f12a">OGRwkbGeometryType</a> </td>
<td class="paramname"> <em>eNewType</em></td>
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<p>Assign the base geometry type for this layer.</p>
<p>All geometry objects using this type must be of the defined type or a derived type. The default upon creation is wkbUnknown which allows for any geometry type. The geometry type should generally not be changed after any OGRFeatures have been created against this definition.</p>
<p>This method is the same as the C function <a class="el" href="ogr__api_8h.html#a11ca3a84b54ac36c5f68a03821f1fa78">OGR_FD_SetGeomType()</a>.</p>
<dl><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>eNewType</em> </td><td>the new type to assign. </td></tr>
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<p>Referenced by <a class="el" href="ogrfeaturedefn_8cpp_source.html#l00181">Clone()</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="ogr__feature_8h_source.html">ogr_feature.h</a></li>
<li>ogrfeaturedefn.cpp</li>
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