Added required if applicable definition

Signed-off-by: Michael Schnuerle <[email protected]>

Author: schnuerle

general-information.md

@@ -6,16 +6,18 @@ This document contains specifications that are shared between the various MDS [A
 
 - [Authorization](#authorization)
 - [Beta Features](#beta-features)
-- [Conditionally Required Fields](#conditionally-required-fields)
 - [Costs and Currencies](#costs-and-currencies)
 - [Data Types](#data-types)
 - [Definitions](#definitions)
 - [Devices](#devices)
+- [Field Types](#field-types)
+  - [Conditionally Required Fields](#conditionally-required-fields)
+  - [Optional Fields](#optional-fields)
+  - [Required if Applicable](#required-if-applicable-fields)
 - [GBFS Compatibility](#gbfs-compatibility)
 - [Geographic Data](#geographic-data)
   - [Intersection Operation](#intersection-operation)
 - [Geography-Driven Events](#geography-driven-events)
-- [Optional Fields](#optional-fields)
 - [Responses](#responses)
   - [Error Messages](#error-messages)
   - [Bulk Responses](#bulk-responses)
@@ -85,12 +87,26 @@ Working Groups and their Steering Committees are expected to review beta designa
 
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-## Conditionally Required Fields
+## Field Types
+
+### Conditionally Required Fields
 
 Conditionally required fields **must** be provided in MDS data feeds from operators if the data is available from the operator, and/or the public agency requests it as part of its permit, RFP, contract, operating agreement, SLA, [Requirements](./policy#requirement) file, or via other authority. Or as part of the conditional requirement as stated in the field's descritpion.
 
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+### Optional Fields
+
+Optional fields **may** be provided in MDS data feeds from operators if the data is available from the operator, and/or the public agency requests it as part of its permit, RFP, contract, operating agreement, SLA, [Requirements](./policy#requirement) file, or via other authority. 
+
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+
+### Required if Applicable Fields
+
+Required if Applicable fields **must** be provided in MDS data feeds from operators if the data is available from the operator, and/or the public agency requests it as part of its permit, RFP, contract, operating agreement, SLA, [Requirements](./policy#requirement) file, or via other authority, and/or the field is relevant to the current provider/mode/program as defined by the public agency. 
+
+[Top][toc]
+
 ## Costs and Currencies
 
 Fields specifying a monetary cost use a currency as specified in [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217#Active_codes). All costs should be given as integers in the currency's smallest unit. As an example, to represent $1 USD, specify an amount of `100` (100 cents).
@@ -175,12 +191,6 @@ During the Beta period for this feature, location and telemetry data remain requ
 
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-## Optional Fields
-
-Optional fields **may** be provided in MDS data feeds from operators if the data is available from the operator, and/or the public agency requests it as part of its permit, RFP, contract, operating agreement, SLA, [Requirements](./policy#requirement) file, or via other authority. 
-
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-
 ## Responses
 
 - **200:** OK: operation successful.