Adding first set of apex-pdp document changes

Adding document changes for auth, context, core, model, services & the
main apex-pdp module.

Change-Id: Id0d026baa258f1dc6998978f9911f3c4a73b5b3b
Issue-ID: POLICY-867
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/site-docs/adoc/fragments/apex-policy-model/concept-eventfield.adoc b/src/site-docs/adoc/fragments/apex-policy-model/concept-eventfield.adoc
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index 000000000..b5646332a
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+//
+// ============LICENSE_START=======================================================
+//  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+// ================================================================================
+// This file is licensed under the CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE
+// Full license text at https://creativecommons.org/licenses/by/4.0/legalcode
+// 
+// SPDX-License-Identifier: CC-BY-4.0
+// ============LICENSE_END=========================================================
+//
+// @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+//
+
+== Concept: EventField
+
+The incoming context and outgoing context of an event are the fields of the event.
+Each field representing a single piece of incoming or outgoing context.
+Each field of an __Event__ is represented by an instance of the __EventField__ concept.
+Each __EventField__ concept instance in an event is keyed with a `ReferenceKey` key, which references the event.
+The __LocalName__ field of the `ReferenceKey` holds the name of the field
+A reference to a __DataType__ concept defines the data type that values of this parameter have at run time.
+