Merge pull request #127 from CycloneDX/issue-87/split

extracted "Core" library from source code 
to a new package: https://packagist.org/packages/cyclonedx/cyclonedx-library

Author: jkowalleck

HISTORY.md

@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 
 ## unreleased
 
+* Changed
+  * Core library
+    * Was moved to an own package: https://packagist.org/packages/cyclonedx/cyclonedx-library  
+      The new external package/library is a one-to-one copy of the original code from this project, which now is a dependency/required of this project. So usage/leverage of the original code is still possible without any changes for third parties.  
+      See [#87] for details.
+
+[#87]: https://github.com/CycloneDX/cyclonedx-php-composer/issues/87
+
 ## 3.4.1 - 2021-09-16
 
 * Fixed

README.md

@@ -68,6 +68,12 @@ Help:
 
 For a demo of _cyclonedx-php-composer_ see the [demo project][demo_readme].
 
+## Internals
+
+This Composer-Plugin utilizes the [CycloneDX library][cyclonedx-library] to generate the actual data structures.
+
+This Composer-Plugin does not expose any additional _public_ api or classes - all code is marked as `@internal` and might change without any notice during version upgrades.
+
 ## Contributing
 
 Feel free to open pull requests.
@@ -86,6 +92,8 @@ See the [LICENSE][license_file] file for the full license.
 [license_file]: https://github.com/CycloneDX/cyclonedx-php-composer/blob/master/LICENSE
 [demo_readme]: https://github.com/CycloneDX/cyclonedx-php-composer/blob/master/demo/README.md
 
+[cyclonedx-library]: https://packagist.org/packages/cyclonedx/cyclonedx-library
+
 [shield_gh-workflow-test]: https://img.shields.io/github/workflow/status/CycloneDX/cyclonedx-php-composer/PHP%20CI/master?logo=GitHub&logoColor=white "build"
 [shield_packagist-version]: https://img.shields.io/packagist/v/cyclonedx/cyclonedx-php-composer?logo=&logoColor=white "packagist"
 [shield_license]: https://img.shields.io/github/license/CycloneDX/cyclonedx-php-composer "license"

composer.json

@@ -27,16 +27,11 @@
     ],
     "require": {
         "php": "^7.3 || ^8.0",
-        "ext-dom": "*",
-        "ext-filter": "*",
-        "ext-json": "*",
-        "ext-libxml": "*",
         "composer-plugin-api": "^2.0",
-        "package-url/packageurl-php": "^1.0",
-        "swaggest/json-schema": "^0.12.38"
+        "cyclonedx/cyclonedx-library": "^1.0",
+        "package-url/packageurl-php": "^1.0"
     },
     "require-dev": {
-        "ext-simplexml": "*",
         "composer/composer": "^2.0.13",
         "phpunit/phpunit": "9.5.10",
         "roave/security-advisories": "dev-latest"
@@ -60,13 +55,12 @@
     },
     "autoload": {
         "psr-4": {
-            "CycloneDX\\Composer\\": "src/Composer/",
-            "CycloneDX\\Core\\": "src/Core/"
+            "CycloneDX\\Composer\\": "src/"
         }
     },
     "autoload-dev": {
         "psr-4": {
-            "CycloneDX\\Tests\\": "tests"
+            "Tests\\": "tests/"
         }
     },
     "prefer-stable": true,