Clarify Auxilliary Registrations Behaviour

Entity IDs, entity types, attribute names, geofenced areas, etc. Ultimately, all

constraints specified in the registration shall be respected.

When a [Context Source]{.HTML-Keyboard} is registered, an operation mode is

selected. This defines the basis for distributed operations and also defines

whether or not the [Context Broker]{.HTML-Keyboard} is permitted to hold context

data about the Entities and Attributes locally itself.

If two registered [Context Sources]{.HTML-Keyboard} are providing context data

for the same Attribute, the Attribute instances can be distinguished by

_`datasetId`_. The mechanism for determining which data shall be returned is

### 9.3.1 Introduction

When a [Context Source]{.HTML-Keyboard} is registered, one of four modes of

operation is selected. This defines the basis for distributed operations and

also defines whether or not the [Context Broker]{.HTML-Keyboard} is permitted to

hold context data about the Entities and Attributes locally itself.

### 9.3.2 Additive registrations

For additive registrations, the [Context Broker]{.HTML-Keyboard} is permitted to

registrations are defined, operations are distributed to all registered [Context

Sources]{.HTML-Keyboard}.

### 9.3.4 Precidence of distributed operations

The presence of a matching **exclusive** [Context Source

Registration]{.HTML-Keyboard} indicates that no further local or distributed

operations shall occur on the specified Attribute of a given Entity. Operations

associated with an **exclusive** [Context Source Registration]{.HTML-Keyboard}

are always processed before any other local or distributed operations.

Distributed operations triggered by **inclusive** [Context Source

Registrations]{.HTML-Keyboard} can take place in parallel to local operations.

When retrieving Entities, the algorithm defined in clause 8.5.3 shall apply in

case of conflict. **redirect** operations are similar, but no actions shall take

place within the local [Context Broker]{.HTML-Keyboard}.

**auxiliary** [Context Source Registrations]{.HTML-Keyboard} only apply during

context information consumption operations, and any distributed operation

asociated with an **auxiliary** [Context Source Registration]{.HTML-Keyboard}

shall only be triggered if no matching data has been received from all

previously encountered [Context Sources]{.HTML-Keyboard}, so that the

possibility of data retrieval from local and all other matching distributed

[Context Sources]{.HTML-Keyboard} has been exhausted.

## 9.4 Matching Context Source registrations

When querying [Context Source Registrations]{.HTML-Keyboard} as described in