Merge branch 'actions-setup'

* actions-setup:
  update readme with validation status badge
  update schmea to use local version of dependancies
  create github action to validate example xml files against the schema

.github/workflows/validate-xml.yml

@@ -0,0 +1,24 @@
+name: Validate AMF Schema and Examples
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v2
+
+    - name: Install xmllint
+      run: sudo apt-get install -y libxml2-utils
+
+    - name: Validate XML Files
+      run: |
+        for file in examples/*.amf; do
+          xmllint --noout --schema schema/acesMetadataFile.xsd $file
+        done

README.md

@@ -1,6 +1,6 @@
 ## ACES Metadata File (AMF) ##
 
-![GitHub release (with filter)](https://img.shields.io/github/v/release/ampas/aces-amf) [![CLA assistant](https://cla-assistant.io/readme/badge/ampas/aces-amf)](https://cla-assistant.io/ampas/aces-amf)
+![AMF Schema and Example Validation](https://github.com/ampas/aces-amf/actions/workflows/validate-xml.yml/badge.svg?event=push) ![GitHub release (with filter)](https://img.shields.io/github/v/release/ampas/aces-amf) [![CLA assistant](https://cla-assistant.io/readme/badge/ampas/aces-amf)](https://cla-assistant.io/ampas/aces-amf)
 
 The ACES Metadata File ("AMF") is a sidecar XML file intended to exchange the metadata required to recreate ACES viewing pipelines. It describes the transforms necessary to configure an ACES viewing pipeline for a collection of related image files.
 

schema/acesMetadataFile.xsd

@@ -13,11 +13,11 @@
 		namespace="urn:ASC:CDL:v1.01"/>
 
 	<!-- Import SMPTE DCML Types Schema -->
-	<xs:import schemaLocation="https://smpte-ra.org/sites/default/files/st433b-2008-am1-2011.xsd"
+	<xs:import schemaLocation="st433b-2008-am1-2011.xsd"
 		namespace="http://www.smpte-ra.org/schemas/433/2008/dcmlTypes/" />
 
 	<!-- Import XML Sig Schema -->
-	<xs:import schemaLocation="https://www.w3.org/TR/2002/REC-xmldsig-core-20020212/xmldsig-core-schema.xsd"
+	<xs:import schemaLocation="xmldsig-core-schema.xsd"
 		namespace="http://www.w3.org/2000/09/xmldsig#" />
 
 	<!-- Define general types -->