class BResourceServiceProvider extends DefaultResourceServiceProvider {
	
	override public boolean canHandle(URI uri) {
		val isWorkflow = Arrays.contains(uri.segments, "B")
		
		return (super.canHandle(uri) && isWorkflow)
	}
}

<extension point="org.eclipse.ui.editors">
<editor			class="com.b.ui.BExecutableExtensionFactory:org.eclipse.xtext.ui.editor.XtextEditor"
			contributorClass="org.eclipse.ui.editors.text.TextEditorActionContributor"
			default="true"
			id="com.b.B"
			name="B Editor">
			<contentTypeBinding
				contentTypeId="com.b.contentType">
			</contentTypeBinding>
		</editor>
	</extension>
	<extension point="org.eclipse.core.contenttype.contentTypes">
	    <content-type
	         base-type="org.eclipse.core.runtime.text"
	         file-extensions="common"
	         id="com.b.contentType"
	         name="B"
	         priority="normal">
	    </content-type>
	</extension>

class BContentHandler extends PlatformContentHandlerImpl {
	public static final String B_FILE_CONTENT_TYPE = "com.b";

	override public boolean canHandle(URI uri) {
		return Arrays.contains(uri.segments, "b")
	}

	override public Map<String, Object> contentDescription(URI uri, InputStream inputStream, Map<?, ?> options, Map<Object, Object> context) throws IOException {
		val Map<String, Object> description = super.contentDescription(uri, inputStream, options, context);
		if (canHandle(uri)) {
			description.put(VALIDITY_PROPERTY, VALID);
			description.put(CONTENT_TYPE_PROPERTY, B_FILE_CONTENT_TYPE);
		}
		return description;
	}
}