Begin recognising elements and attributes

.gitignore

@@ -0,0 +1,5 @@
+/.phpcs-cache
+/phpcs.xml
+/phpstan.neon
+/phpunit.xml
+/vendor/

.travis.yml

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+language: php
+
+php: 7.3
+
+before_install:
+    - phpenv config-rm xdebug.ini || true
+
+install:
+    - travis_retry composer install --classmap-authoritative --no-suggest --prefer-dist
+
+jobs:
+    include:
+
+        - stage: Test
+          name: Tests
+          script:
+              - vendor/bin/phpunit
+
+        - stage: Code Quality
+          name: Coding standards
+          script:
+              - vendor/bin/phpcs -p
+
+        - stage: Code Quality
+          name: Static analysis
+          script:
+              - vendor/bin/phpstan analyse
+
+stages:
+    - Test
+    - name: Code Quality
+      if: type = pull_request
+
+cache:
+    directories:
+        - $HOME/.composer/cache/files
+
+if: |
+    branch = master OR \
+    branch =~ /^(?:[0-9]|[1-9][0-9]*)\.(?:[0-9]|[1-9][0-9]*)$/ OR \
+    tag IS present OR \
+    type = pull_request

composer.json

@@ -0,0 +1,43 @@
+{
+    "type": "project",
+    "license": "MIT",
+    "autoload-dev": {
+        "psr-4": {
+            "tests\\Libero\\JatsSupport\\": "tests/"
+        }
+    },
+    "require-dev": {
+        "php": "^7.3",
+        "ext-dom": "*",
+        "ext-xsl": "*",
+        "fluentdom/fluentdom": "^7.1",
+        "jats/schema": "^1.1",
+        "libero/coding-standard": "^0.4.0",
+        "libero/xml-validator": "^0.2",
+        "lstrojny/functional-php": "^1.9",
+        "phpstan/phpstan": "^0.11.2",
+        "phpstan/phpstan-phpunit": "^0.11.0",
+        "phpunit/phpunit": "^8.0",
+        "symfony/finder": "^4.2"
+    },
+    "config": {
+        "platform": {
+            "php": "7.3.0"
+        },
+        "secure-http": false,
+        "sort-packages": true
+    },
+    "repositories": [
+        {
+            "type": "package",
+            "package": {
+                "name": "jats/schema",
+                "version": "1.1",
+                "dist": {
+                    "url": "ftp://ftp.ncbi.nih.gov/pub/jats/archiving/1.1/rng/JATS-Archiving-1-1-MathML3-DTD-RNG.zip",
+                    "type": "zip"
+                }
+            }
+        }
+    ]
+}