info: XMP dwc namespace format

android/app/build.gradle

@@ -56,6 +56,9 @@ android {
         // minSdkVersion constraints:
         // - Flutter & other plugins: 16
         // - google_maps_flutter v2.1.1: 20
+        // - to build XML documents from XMP data, `metadata-extractor` and `PixyMeta` rely on `DocumentBuilder`,
+        // which implementation `DocumentBuilderImpl` is provided by the OS and is not customizable on Android,
+        // but the implementation on API <19 is not robust enough and fails to build XMP documents
         minSdkVersion 19
         targetSdkVersion 31
         versionCode flutterVersionCode.toInteger()

lib/ref/xmp.dart

@@ -13,6 +13,7 @@ class XMP {
     'crs': 'Camera Raw Settings',
     'dc': 'Dublin Core',
     'drone-dji': 'DJI Drone',
+    'dwc': 'Darwin Core',
     'exif': 'Exif',
     'exifEX': 'Exif Ex',
     'GettyImagesGIFT': 'Getty Images',

lib/widgets/viewer/info/metadata/xmp_namespaces.dart

@@ -6,6 +6,7 @@ import 'package:aves/widgets/common/identity/highlight_title.dart';
 import 'package:aves/widgets/viewer/info/common.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/crs.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/darktable.dart';
+import 'package:aves/widgets/viewer/info/metadata/xmp_ns/dwc.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/exif.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/google.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/iptc.dart';
@@ -38,6 +39,8 @@ class XmpNamespace extends Equatable {
         return XmpCrsNamespace(rawProps);
       case XmpDarktableNamespace.ns:
         return XmpDarktableNamespace(rawProps);
+      case XmpDwcNamespace.ns:
+        return XmpDwcNamespace(rawProps);
       case XmpExifNamespace.ns:
         return XmpExifNamespace(rawProps);
       case XmpGAudioNamespace.ns:

lib/widgets/viewer/info/metadata/xmp_ns/dwc.dart

@@ -0,0 +1,92 @@
+import 'package:aves/widgets/viewer/info/metadata/xmp_namespaces.dart';
+import 'package:aves/widgets/viewer/info/metadata/xmp_structs.dart';
+import 'package:flutter/widgets.dart';
+
+class XmpDwcNamespace extends XmpNamespace {
+  static const ns = 'dwc';
+
+  static final dcTermsLocationPattern = RegExp(ns + r':dctermsLocation/(.*)');
+  static final eventPattern = RegExp(ns + r':Event/(.*)');
+  static final geologicalContextPattern = RegExp(ns + r':GeologicalContext/(.*)');
+  static final identificationPattern = RegExp(ns + r':Identification/(.*)');
+  static final measurementOrFactPattern = RegExp(ns + r':MeasurementOrFact/(.*)');
+  static final occurrencePattern = RegExp(ns + r':Occurrence/(.*)');
+  static final recordPattern = RegExp(ns + r':Record/(.*)');
+  static final resourceRelationshipPattern = RegExp(ns + r':ResourceRelationship/(.*)');
+  static final taxonPattern = RegExp(ns + r':Taxon/(.*)');
+
+  final dcTermsLocation = <String, String>{};
+  final event = <String, String>{};
+  final identification = <String, String>{};
+  final geologicalContext = <String, String>{};
+  final measurementOrFact = <String, String>{};
+  final occurrence = <String, String>{};
+  final record = <String, String>{};
+  final resourceRelationship = <String, String>{};
+  final taxon = <String, String>{};
+
+  XmpDwcNamespace(Map<String, String> rawProps) : super(ns, rawProps);
+
+  @override
+  bool extractData(XmpProp prop) {
+    var hasStructs = extractStruct(prop, dcTermsLocationPattern, dcTermsLocation);
+    hasStructs |= extractStruct(prop, eventPattern, event);
+    hasStructs |= extractStruct(prop, geologicalContextPattern, geologicalContext);
+    hasStructs |= extractStruct(prop, measurementOrFactPattern, measurementOrFact);
+    hasStructs |= extractStruct(prop, identificationPattern, identification);
+    hasStructs |= extractStruct(prop, occurrencePattern, occurrence);
+    hasStructs |= extractStruct(prop, recordPattern, record);
+    hasStructs |= extractStruct(prop, resourceRelationshipPattern, resourceRelationship);
+    hasStructs |= extractStruct(prop, taxonPattern, taxon);
+    return hasStructs;
+  }
+
+  @override
+  List<Widget> buildFromExtractedData() => [
+        if (dcTermsLocation.isNotEmpty)
+          XmpStructCard(
+            title: 'DC Terms Location',
+            struct: dcTermsLocation,
+          ),
+        if (event.isNotEmpty)
+          XmpStructCard(
+            title: 'Event',
+            struct: event,
+          ),
+        if (geologicalContext.isNotEmpty)
+          XmpStructCard(
+            title: 'Geological Context',
+            struct: geologicalContext,
+          ),
+        if (identification.isNotEmpty)
+          XmpStructCard(
+            title: 'Identification',
+            struct: identification,
+          ),
+        if (measurementOrFact.isNotEmpty)
+          XmpStructCard(
+            title: 'Measurement Or Fact',
+            struct: measurementOrFact,
+          ),
+        if (occurrence.isNotEmpty)
+          XmpStructCard(
+            title: 'Occurrence',
+            struct: occurrence,
+          ),
+        if (record.isNotEmpty)
+          XmpStructCard(
+            title: 'Record',
+            struct: record,
+          ),
+        if (resourceRelationship.isNotEmpty)
+          XmpStructCard(
+            title: 'Resource Relationship',
+            struct: resourceRelationship,
+          ),
+        if (taxon.isNotEmpty)
+          XmpStructCard(
+            title: 'Taxon',
+            struct: taxon,
+          ),
+      ];
+}