add maintenance code to projectType

docs/reference/schema.md

@@ -18,7 +18,7 @@ The top-level object in OC4IDS is a project.
 
 A project is defined as:
 
-> The development of a set of infrastructure assets in a specified location, generally the responsibility of a single procuring entity and budget authority: for example, a highway overpass or a university campus.
+> The development, maintenance, rehabilitation, expansion, replacement and/or decommissioning of a set of infrastructure assets in a specified location, generally the responsibility of a single procuring entity and budget authority: for example, a highway overpass or a university campus. Development covers project identification, preparation, implementation and completion.
 
 A project's fields include:
 

schema/project-level/codelists/projectType.csv

@@ -1,6 +1,7 @@
 Code,Title,Description
 construction,Construction,The primary focus of this project is the construction of a new asset.
-rehabilitation,Rehabilitation,The primary focus of this project is the rehabilitation of an existing asset.
+maintenance,Maintenance,The primary focus of this project is proactively identifying and addressing deficiencies in an existing asset to slow the deterioration of the asset.
+rehabilitation,Rehabilitation,The primary focus of this project is reactively addressing significant deficiencies in an existing asset to stop the deterioration of the asset.
 replacement,Replacement,The primary focus of this project is the replacement of an existing asset.
-expansion,Expansion,The primary focus of this project is the expansion of an existing asset.
+expansion,Expansion,The primary focus of this project is the expansion or upgrade of an existing asset.
 decommissioning,Decommissioning,The primary focus of this project is the decommissioning of an existing asset.

schema/project-level/project-schema.json

@@ -2,7 +2,7 @@
   "$schema": "http://json-schema.org/draft-04/schema#",
   "id": "https://standard.open-contracting.org/infrastructure/schema/0__9__5/project-schema.json",
   "title": "Open Contracting for Infrastructure Data Standard Schema",
-  "description": "The Open Contracting for Infrastructure Data Standard (OC4IDS) schema sets out a data structure for capturing and exchanging information about infrastructure projects in line with the disclosure requirements of the [CoST Infrastructure Data Standard](https://infrastructuretransparency.org/resource/977/). OC4IDS defines an \"infrastructure project\" as: \"the development, maintenance and decommissioning of a set of infrastructure assets in a specified location, generally the responsibility of a single procuring entity and budget authority: for example, a highway overpass or a university campus. Development covers project identification, preparation, implementation and completion.\"",
+  "description": "The Open Contracting for Infrastructure Data Standard (OC4IDS) schema sets out a data structure for capturing and exchanging information about infrastructure projects in line with the disclosure requirements of the [CoST Infrastructure Data Standard](https://infrastructuretransparency.org/resource/977/). OC4IDS defines an \"infrastructure project\" as: \"the development, maintenance, rehabilitation, expansion, replacement and/or decommissioning of a set of infrastructure assets in a specified location, generally the responsibility of a single procuring entity and budget authority: for example, a highway overpass or a university campus. Development covers project identification, preparation, implementation and completion.\"",
   "type": "object",
   "required": [
     "id"
@@ -145,6 +145,7 @@
       "type": "string",
       "enum": [
         "construction",
+        "maintenance",
         "rehabilitation",
         "replacement",
         "expansion",