Remove a redundant link to examples. Add a link to an example of dire…

…ct GeoAPI implementation as a complement to wrapper examples.

_pages/java/examples/index.md

@@ -17,10 +17,16 @@ There is 3 categories of examples, depending on target audience:
 * [Testing an implementation](testing.html) with the [conformance tests](../../conformance/index.html).
 
 
-## Wrappers to existing libraries
+## Libraries with public source code
 
-The following projects provide GeoAPI implementations as wrappers around independent libraries.
+The following projects provide GeoAPI implementations as wrappers around independent libraries:
 
 * [NetCDF wrapper](https://github.com/Unidata/geoapi-netcdf-java) in Java for the UCAR netCDF library.
 * [Proj.6 wrapper](https://github.com/osgeo/PROJ-JNI) in Java for version 6 or later of the PROJ library.
 * [GDAL wrapper](https://github.com/Geomatys/geoapi-gdal) using Java and Python bindings to the GDAL library.
+
+The following projects provide direct implementations of GeoAPI:
+
+* [Apache SIS](https://sis.apache.org) in Java, in particular the
+  [metadata](https://github.com/apache/sis/tree/main/endorsed/src/org.apache.sis.metadata/main/org/apache/sis/metadata/iso) and
+  [referencing](https://github.com/apache/sis/tree/main/endorsed/src/org.apache.sis.referencing/main/org/apache/sis/referencing) packages.

index.md

@@ -34,5 +34,3 @@ Clients can use the API without concern for the particular implementation which
 In order to use GeoAPI, developers must select a third-party implementation.
 Examples about how to use GeoAPI with some third-party libraries are available
 in [Java](java/examples/index.html) and [Python](python/examples/index.html).
-There is also some more examples about how to [implement and test](java/examples/index.html)
-a new GeoAPI implementation.