Use JDK 17, add README.

README.in

@@ -0,0 +1,14 @@
+
+## xstructural
+
+XSLT implementation of the structural documentation format.
+
+## Features
+
+* [OSGi-ready](https://www.osgi.org/)
+* [JPMS-ready](https://en.wikipedia.org/wiki/Java_Platform_Module_System)
+* ISC license.
+
+## Usage
+
+See the [documentation](https://www.io7m.com/software/xstructural).

README.md

@@ -13,3 +13,18 @@ xstructural
 | OpenJDK (Temurin) LTS | Linux | [![Build (OpenJDK (Temurin) LTS, Linux)](https://img.shields.io/github/actions/workflow/status/io7m-com/xstructural/main.linux.temurin.lts.yml)](https://www.github.com/io7m-com/xstructural/actions?query=workflow%3Amain.linux.temurin.lts)|
 | OpenJDK (Temurin) Current | Windows | [![Build (OpenJDK (Temurin) Current, Windows)](https://img.shields.io/github/actions/workflow/status/io7m-com/xstructural/main.windows.temurin.current.yml)](https://www.github.com/io7m-com/xstructural/actions?query=workflow%3Amain.windows.temurin.current)|
 | OpenJDK (Temurin) LTS | Windows | [![Build (OpenJDK (Temurin) LTS, Windows)](https://img.shields.io/github/actions/workflow/status/io7m-com/xstructural/main.windows.temurin.lts.yml)](https://www.github.com/io7m-com/xstructural/actions?query=workflow%3Amain.windows.temurin.lts)|
+
+## xstructural
+
+XSLT implementation of the structural documentation format.
+
+## Features
+
+* [OSGi-ready](https://www.osgi.org/)
+* [JPMS-ready](https://en.wikipedia.org/wiki/Java_Platform_Module_System)
+* ISC license.
+
+## Usage
+
+See the [documentation](https://www.io7m.com/software/xstructural).
+

pom.xml

@@ -29,9 +29,12 @@
   </modules>
 
   <properties>
-    <com.io7m.immutables.version>2.10.0</com.io7m.immutables.version>
+    <!-- Configuration -->
     <io7m.api.previousVersion>1.8.0</io7m.api.previousVersion>
-    <io7m.java.targetJavaVersion>21</io7m.java.targetJavaVersion>
+    <io7m.java.targetJavaVersion>17</io7m.java.targetJavaVersion>
+
+    <!-- Third-party dependencies. -->
+    <com.io7m.immutables.version>2.10.0</com.io7m.immutables.version>
     <io7m.maven-api.version>3.9.6</io7m.maven-api.version>
     <junit.version>5.10.1</junit.version>
   </properties>
@@ -73,6 +76,10 @@
       <id>sonatype-nexus-staging</id>
       <url>https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/</url>
     </repository>
+    <snapshotRepository>
+      <id>sonatype-nexus-snapshots</id>
+      <url>https://s01.oss.sonatype.org/content/repositories/snapshots/</url>
+    </snapshotRepository>
   </distributionManagement>
 
   <ciManagement>