diff --git a/.travis.yml b/.travis.yml
old mode 100755
new mode 100644
index dcc315d..861db7f
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,15 +1,10 @@
 language: php
 
 php:
-  - 5.6
-  - 7.0
-  - 7.1
+  - 7.2
 
 install:
   - composer install
 
 script:
-  - vendor/bin/phpcs -s
-  - vendor/bin/parallel-lint . --exclude vendor
-  - vendor/bin/phpdoc -q --template=checkstyle
-  - (! grep -B 1 error docs/api/checkstyle.xml)
+  - composer test
diff --git a/composer.json b/composer.json
index 766a310..3f91ef7 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "wikisource/api",
     "description": "A PHP API to Wikisources (all languages).",
     "type": "library",
-    "license": "GPL-2.0+",
+    "license": "GPL-2.0-or-later",
     "support": {
         "irc": "irc://irc.freenode.org/wikisource",
         "issues": "https://phabricator.wikimedia.org/tag/wikisource-api/",
@@ -19,19 +19,28 @@
         }
     },
     "require": {
+        "ext-json": "*",
+        "ext-simplexml": "*",
         "psr/cache": "^1.0",
         "psr/log": "^1.0",
         "dflydev/dot-access-data": "^1.0",
         "addwiki/mediawiki-api": "^0.7",
-        "symfony/dom-crawler": "^3.1"
+        "symfony/dom-crawler": "^4.2"
     },
     "require-dev": {
+        "mediawiki/minus-x": "^0.3",
         "jakub-onderka/php-parallel-lint": "^0.9",
         "mediawiki/mediawiki-codesniffer": "^13.0",
-        "phpunit/phpunit": "^5.6",
-        "phpdocumentor/phpdocumentor": "^2.9",
         "tedivm/stash": "^0.14",
         "monolog/monolog": "^1.21",
         "eloquent/asplode": "^2.2"
+    },
+    "scripts": {
+        "test": [
+            "composer validate",
+            "parallel-lint . --exclude vendor",
+            "minus-x check .",
+            "phpcs -s"
+        ]
     }
 }
diff --git a/src/IndexPage.php b/src/IndexPage.php
index f0e5f10..3627849 100644
--- a/src/IndexPage.php
+++ b/src/IndexPage.php
@@ -178,15 +178,51 @@ protected function getHtmlCrawler() {
 	 * Get a list of all pages: their numbers, labels, statuses, and URLs. Currently doing this in a
 	 * pretty clunky way that probably makes quite a few assumptions based on English Wikisource.
 	 * This method sends a request to Wikisource.
+	 *
+	 * @param bool $onlyExisting Only return info about pages that exist. This does not return the
+	 * pages' label (it is set to the page number).
 	 * @return string[] Array of arrays with keys 'num', 'label', 'status', 'url'.
 	 */
-	public function getPageList() {
+	public function getPageList( $onlyExisting = false ) {
+		$pagelist = [];
+
+		// Use the API to get a list of all existing pages.
+		if ( $onlyExisting ) {
+			$req = new FluentRequest();
+			$req->setAction( 'query' );
+			$indexNsLocalName = $this->wikisource
+				->getNamespaceLocalName( Wikisource::NS_NAME_INDEX );
+			$title = substr( $this->getTitle(), strlen( $indexNsLocalName ) + 1 );
+			$ns = $this->wikisource->getNamespaceId( Wikisource::NS_NAME_PAGE );
+			$reqParams = [
+				'prop' => 'proofread',
+				'generator' => 'prefixsearch',
+				'gpssearch' => $title,
+				'gpsnamespace' => $ns,
+				'gpslimit' => 500,
+			];
+			$req->addParams( $reqParams );
+			$res = $this->wikisource->sendApiRequest( $req, 'query.pages' );
+			foreach ( $res as $page ) {
+				$subpage = substr( $page['title'], strrpos( $page['title'], '/' ) + 1 );
+				// @TODO The label can not currently be retrieved from the API.
+				$pagelist['page-'.$subpage] = [
+					'label' => $subpage,
+					'num' => $subpage,
+					'url' => 'https://'.$this->getWikisource()->getDomainName().'/wiki/'.$page['title'],
+					'quality' => $page['proofread']['quality'],
+					'title' => $page['title'],
+				];
+			}
+			return $pagelist;
+		}
+
+		// If we need non-existing pages as well, we have to scrape the HTML. :-(
 		preg_match( '/(.*wikisource.org)/', $this->pageInfo['canonicalurl'], $matches );
 		$baseUrl = isset( $matches[1] ) ? $matches[1] : false;
 
 		$pageCrawler = $this->getHtmlCrawler();
 		$pagelistAnchors = $pageCrawler->filterXPath( "//div[contains(@class, 'index-pagelist')]//a" );
-		$pagelist = [];
 		foreach ( $pagelistAnchors as $pageLink ) {
 			// Get page URL (which is relative, starting with /w/index.php) and page number.
 			$anchorHref = $pageLink->getAttribute( 'href' );
diff --git a/src/Wikisource.php b/src/Wikisource.php
index 89b1b3e..b6dbab7 100644
--- a/src/Wikisource.php
+++ b/src/Wikisource.php
@@ -20,6 +20,9 @@ class Wikisource {
 	/** The canonical name of the 'Index' namespace. */
 	const NS_NAME_INDEX = 'Index';
 
+	/** The canonical name of the 'Page' namespace. */
+	const NS_NAME_PAGE = 'Page';
+
 	/** @var WikisourceApi The parent API object. */
 	protected $api;
 
@@ -126,6 +129,38 @@ public function getIndexPageFromUrl( $url ) {
 	 * @return int The namespace ID, or false if it can't be found.
 	 */
 	public function getNamespaceId( $namespaceName ) {
+		foreach ( $this->getNamespaces() as $ns ) {
+			if ( isset( $ns['canonical'] ) && $ns['canonical'] === $namespaceName ) {
+				return $ns['id'];
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Get the local name for a single namespace.
+	 *
+	 * @param string $namespaceName The name of the namespace to get.
+	 * @return string
+	 */
+	public function getNamespaceLocalName( $namespaceName ) {
+		if ( $namespaceName === '' ) {
+			return '';
+		}
+		$namespaces = $this->getNamespaces();
+		foreach ( $namespaces as $ns ) {
+			if ( isset( $ns['canonical'] ) && $ns['canonical'] === $namespaceName && isset( $ns['*'] ) ) {
+				return $ns['*'];
+			}
+		}
+	}
+
+	/**
+	 * Get information about the namespaces on this Wikisource.
+	 *
+	 * @return array
+	 */
+	public function getNamespaces() {
 		$cacheKey = 'namespaces'.$this->getLanguageCode();
 		$namespaces = $this->getWikisoureApi()->cacheGet( $cacheKey );
 		if ( $namespaces !== false ) {
@@ -133,18 +168,13 @@ public function getNamespaceId( $namespaceName ) {
 		} else {
 			$this->logger->debug( "Requesting namespace data for ".$this->getLanguageCode() );
 			$request = FluentRequest::factory()
-					->setAction( 'query' )
-					->setParam( 'meta', 'siteinfo' )
-					->setParam( 'siprop', 'namespaces' );
+				->setAction( 'query' )
+				->setParam( 'meta', 'siteinfo' )
+				->setParam( 'siprop', 'namespaces' );
 			$namespaces = $this->sendApiRequest( $request, 'query.namespaces' );
 			$this->getWikisoureApi()->cacheSet( $cacheKey, $namespaces );
 		}
-		foreach ( $namespaces as $ns ) {
-			if ( isset( $ns['canonical'] ) && $ns['canonical'] === $namespaceName ) {
-				return $ns['id'];
-			}
-		}
-		return false;
+		return $namespaces;
 	}
 
 	/**