Set up schema validation on github worfklows

.github/workflows/validate.yml

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+name: Validate DAP4 XML
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  validate-dmr:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install lxml pytest
+
+      - name: Run DMR XML validation
+        run: |
+          pytest -v

.gitignore

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+*.py[cod]
+
+# C extensions
+*.so
+
+# Packages
+*.egg
+*.egg-info
+dist
+build
+eggs
+parts
+bin
+var
+sdist
+develop-eggs
+.installed.cfg
+lib
+lib64
+
+# Installer logs
+pip-log.txt
+
+# ignore shell script at base level
+*.sh
+
+# Unit test / coverage reports
+.coverage
+.tox
+nosetests.xml
+
+# Translations
+*.mo
+
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# Vim
+*.swp
+
+.cache
+__pycache__
+tests/__pycache__
+
+# OS-X Finder
+*.DS_Store
+
+# IDEA Projects
+.idea

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/psf/black
+    rev: 23.12.1
+    hooks:
+      - id: black
+        files: ^tests/.*\.py$
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.3.2
+    hooks:
+      - id: ruff
+        args: ["--fix"]
+        files: ^tests/.*\.py$
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: check-xml
+        files: |
+          ^dap4/dap4\.xsd$
+          ^tests/data/.*\.dmr$
+      - id: trailing-whitespace
+        files: |
+          ^dap4/.*$
+          ^tests/.*$
+      - id: end-of-file-fixer
+        files: |
+          ^dap4/.*$
+          ^tests/.*$