diff --git a/docbook/Dockerfile b/docbook/Dockerfile
deleted file mode 100644
index e5d1f9a..0000000
--- a/docbook/Dockerfile
+++ /dev/null
@@ -1,38 +0,0 @@
-FROM ubuntu:18.04
-MAINTAINER Norman Tovey-Walsh <ndw@nwalsh.com>
-
-RUN apt-get update
-RUN apt-get dist-upgrade -y
-RUN apt-get install -y default-jre maven unzip
-
-RUN apt-get install -y software-properties-common
-RUN add-apt-repository ppa:deadsnakes/ppa -y
-RUN apt-get update
-RUN apt-get install -y python3.8 python3-pip
-
-RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1
-RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 10
-
-# Use Maven to install the packages that docbook-xslTNG depends on
-RUN mvn org.apache.maven.plugins:maven-dependency-plugin:2.4:get \
-        -Dartifact=net.sf.saxon:Saxon-HE:10.6
-RUN mvn org.apache.maven.plugins:maven-dependency-plugin:2.4:get \
-        -Dartifact=com.drewnoakes:metadata-extractor:2.15.0
-RUN mvn org.apache.maven.plugins:maven-dependency-plugin:2.4:get \
-        -Dartifact=org.relaxng:jing:20181222
-RUN mvn org.apache.maven.plugins:maven-dependency-plugin:2.4:get \
-        -Dartifact=org.xmlresolver:xmlresolver:3.1.0
-RUN mvn org.apache.maven.plugins:maven-dependency-plugin:2.4:get \
-        -Dartifact=com.nwalsh:sinclude:4.0.0
-RUN mvn org.apache.maven.plugins:maven-dependency-plugin:2.4:get \
-        -Dartifact=org.slf4j:slf4j-simple:1.7.30
-
-ARG VERSION=1.6.0
-
-WORKDIR /opt
-ADD https://github.com/docbook/xslTNG/releases/download/${VERSION}/docbook-xslTNG-${VERSION}.zip .
-RUN unzip docbook-xslTNG-${VERSION}.zip
-
-WORKDIR docbook-xslTNG-${VERSION}
-
-ENTRYPOINT ["bin/docbook"]
diff --git a/docbook/README b/docbook/README
deleted file mode 100644
index 3108ccf..0000000
--- a/docbook/README
+++ /dev/null
@@ -1,45 +0,0 @@
-DocBook xslTNG version 1.6.0
-
-This directory contains an experimental Dockerfile. Using docker
-allows you to isolate the environment necessary to run the DocBook
-xslTNG stylesheets from your local environment.
-
-1. Build the docker image. In this directory, run the docker build
-   command:
-
-   docker build -t docbook-xslt .
-
-   The "-t" option provides a tag for the image; you can make this
-   anything you want. There's a VERSION build argument if you want
-   to build a particular release. For example,
-
-   docker build --build-arg VERSION=0.9.14 -t docbook-xslt .
-
-   will build a Docker image for the 0.9.14 release of the stylesheets
-   irrespective of the version in the Dockerfile.
-
-2. Run the image, for example:
-
-   docker run docbook-xsltng samples/article.xml
-
-   If you chose a different tag when you built the image, use that tag
-   in place of 'docbook-xsltng' in the run command. Everything after the
-   container tag becomes options to the 'docbook' Python script.
-
-   Note that the context the script runs in is *inside* the container.
-   It can't for example, see your local filesystem.
-
-You can use the Docker facilities for mounting directories to change
-what documents the script can access. For example:
-
-   docker run -v /tmp:/output -v /path/to/samples:/input \
-          docbook-xsltng /input/article.xml chunk=index.html \
-          chunk-output-base-uri=/output/
-
-Assuming that the 'samples' directory in the distribution is located
-at /path/to/samples, this will chunk the article.xml sample document
-that the script sees in /input (which is where you mounted samples)
-and it will write the output to /output (which is where you mounted
-/tmp).
-
-When the script finishes, the chunked output will be in /tmp