diff --git a/composer.json b/composer.json
index 0212376..2b34305 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "license": "MIT",
     "require": {
         "php": "^8.4",
-        "longitude-one/spatial-types": "0.0.1-alpha.1"
+        "longitude-one/spatial-types": "0.0.1-alpha.2"
     },
     "require-dev": {
         "phpunit/phpunit": "^13",
diff --git a/docs/strategies.md b/docs/strategies.md
index 66404a3..ec81ba0 100644
--- a/docs/strategies.md
+++ b/docs/strategies.md
@@ -312,10 +312,10 @@ under the same caller responsibilities described above.
 
 The approved MultiPoint contract rejects any EMPTY Point member with
 `UnsupportedGeometryStructureException`, including an aggregate made entirely
-of EMPTY members. No member is omitted or replaced. The installed spatial-types
-`0.0.1-alpha.1` model currently prevents constructing such aggregates: its shared
-point-collection constructor throws `LongitudeOne\SpatialTypes\Exception\InvalidValueException`
-before the writer is called. An empty aggregate with no members remains supported.
+of EMPTY members. No member is omitted or replaced. The required spatial-types
+`0.0.1-alpha.2` model supports constructing these aggregates, so the writer rejects
+them through its public structural exception. An empty aggregate with no members
+remains supported.
 
 The approved contracts for later geometry contributions preserve nested,
 singleton and homogeneous GeometryCollections. These deliberately do not apply
diff --git a/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeographyMultiPointTest.php b/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeographyMultiPointTest.php
index 1650163..dc2009c 100644
--- a/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeographyMultiPointTest.php
+++ b/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeographyMultiPointTest.php
@@ -18,7 +18,9 @@
 
 use LongitudeOne\SpatialTypes\Reference\SpatialReference;
 use LongitudeOne\SpatialTypes\Types\Dimension2\Geography\MultiPoint;
+use LongitudeOne\SpatialTypes\Types\Dimension2\Geography\Point;
 use LongitudeOne\SpatialWriter\Exception\UnsupportedDimensionException;
+use LongitudeOne\SpatialWriter\Exception\UnsupportedGeometryStructureException;
 use LongitudeOne\SpatialWriter\Strategy\GeoJsonStrategy;
 use LongitudeOne\SpatialWriter\Writer;
 use PHPUnit\Framework\Attributes\CoversClass;
@@ -109,6 +111,38 @@ public function testRejectEmptyXyzm(): void
         (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
     }
 
+    /** Reject an EMPTY member after a non-empty position without returning partial output. */
+    public function testRejectMixedEmptyMembersXy(): void
+    {
+        $multiPoint = new MultiPoint([new Point(1, 2), new Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
+    /** Reject an EMPTY member after a non-empty position without returning partial output. */
+    public function testRejectMixedEmptyMembersXyz(): void
+    {
+        $multiPoint = new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geography\MultiPoint([new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geography\Point(1, 2, 3), new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geography\Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
+    /** Distinguish an aggregate containing only EMPTY members from one with no members. */
+    public function testRejectOnlyEmptyMembersXy(): void
+    {
+        $multiPoint = new MultiPoint([new Point(), new Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
+    /** Distinguish an aggregate containing only EMPTY members from one with no members. */
+    public function testRejectOnlyEmptyMembersXyz(): void
+    {
+        $multiPoint = new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geography\MultiPoint([new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geography\Point(), new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geography\Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
     /** Reject an incompatible concrete input without modifying it. */
     public function testRejectXym(): void
     {
diff --git a/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeometryMultiPointTest.php b/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeometryMultiPointTest.php
index 675e91a..63cbbea 100644
--- a/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeometryMultiPointTest.php
+++ b/tests/LongitudeOne/SpatialWriter/Tests/Unit/Strategy/GeoJson/GeometryMultiPointTest.php
@@ -18,7 +18,9 @@
 
 use LongitudeOne\SpatialTypes\Reference\SpatialReference;
 use LongitudeOne\SpatialTypes\Types\Dimension2\Geometry\MultiPoint;
+use LongitudeOne\SpatialTypes\Types\Dimension2\Geometry\Point;
 use LongitudeOne\SpatialWriter\Exception\UnsupportedDimensionException;
+use LongitudeOne\SpatialWriter\Exception\UnsupportedGeometryStructureException;
 use LongitudeOne\SpatialWriter\Strategy\GeoJsonStrategy;
 use LongitudeOne\SpatialWriter\Writer;
 use PHPUnit\Framework\Attributes\CoversClass;
@@ -109,6 +111,38 @@ public function testRejectEmptyXyzm(): void
         (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
     }
 
+    /** Reject an EMPTY member after a non-empty position without returning partial output. */
+    public function testRejectMixedEmptyMembersXy(): void
+    {
+        $multiPoint = new MultiPoint([new Point(1, 2), new Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
+    /** Reject an EMPTY member after a non-empty position without returning partial output. */
+    public function testRejectMixedEmptyMembersXyz(): void
+    {
+        $multiPoint = new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geometry\MultiPoint([new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geometry\Point(1, 2, 3), new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geometry\Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
+    /** Distinguish an aggregate containing only EMPTY members from one with no members. */
+    public function testRejectOnlyEmptyMembersXy(): void
+    {
+        $multiPoint = new MultiPoint([new Point(), new Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
+    /** Distinguish an aggregate containing only EMPTY members from one with no members. */
+    public function testRejectOnlyEmptyMembersXyz(): void
+    {
+        $multiPoint = new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geometry\MultiPoint([new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geometry\Point(), new \LongitudeOne\SpatialTypes\Types\Dimension3z\Geometry\Point()]);
+        $this->expectException(UnsupportedGeometryStructureException::class);
+        (new Writer(new GeoJsonStrategy()))->convert($multiPoint);
+    }
+
     /** Reject an incompatible concrete input without modifying it. */
     public function testRejectXym(): void
     {
diff --git a/tests/README.md b/tests/README.md
index 7bb43e2..f794eb3 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -184,3 +184,6 @@ failure and the unchanged internal exception for a missing LineString interface.
 MultiPoint examples cover both families in XY/XYZ, empty aggregates, singletons,
 duplicate positions, member and ordinate order, omitted reference metadata, and
 XYM/XYZM rejection including empty aggregates.
+Concrete XY/XYZ examples also verify rejection of mixed non-empty/EMPTY members
+and aggregates containing only EMPTY Points in both families, using spatial-types
+`0.0.1-alpha.2`.