<para>If you don't specify [child_layer] (or set it to NULL) this layer would contain Basic TopoGeometries (composed by primitive topology elements).
Otherwise this layer will contain hierarchical TopoGeometries (composed by TopoGeometries from the child_layer).</para>
- <para>Once the layer is created (it's id is returned by the AddTopoGeometryColumn function) you're ready to construct TopoGeometry objects in it</para>
+ <para>Once the layer is created (its id is returned by the AddTopoGeometryColumn function) you're ready to construct TopoGeometry objects in it</para>
<para>Valid <varname>feature_type</varname>s are: POINT, LINE, POLYGON, COLLECTION</para>
<!-- use this format if new function -->
<refname>AddFace</refname>
<refpurpose>
-Registers a face primitive to a topology and get it's identifier.
+Registers a face primitive to a topology and get its identifier.
</refpurpose>
</refnamediv>
<title>Description</title>
<para>
-Registers a face primitive to a topology and get it's identifier.
+Registers a face primitive to a topology and get its identifier.
</para>
<para>