LOIN metadata description (#303)

Make Purpose and Milestone definitions and examples aligned with the Level of Information Need (EN 17412-1, 5.2-5.3).

Documentation/ids-metadata.md

@@ -13,9 +13,9 @@ Each `.ids` file has basic metadata that are common to all **Specifications** li
 | Version     | The version of the IDS, to keep track of changes that have been made. Semantic versioning is recommended where versioning follows the naming scheme of X.Y, where Y represents a minor change, such as changes in metadata, description, or spelling errors, and X represents a major change, where models that used to pass or fail in a previous version may yield a different result. | "1.0" or "2.1"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
 | Author      | The author of the IDS, provided as an email contact address                                                                                                                                                                                                                                                                                                                              | "<[email protected]>"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
 | Date        | The date the IDS was published                                                                                                                                                                                                                                                                                                                                                           | "2022-01-01"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
-| Description | One or more sentences that further elaborate on a description who the IDS might be for, why it is created, what projects it might apply to, and so on.                                                                                                                                                                                                                                   | "Minimum requirements for all OpenBIM projects to ensure basic coordination and data scheduling can be done by all stakeholders. Expected to be run prior to model sharing and is a requirement for all project milestones." or "Specifies required properties that have a large impact on the accuracy of cost estimation and quantities that are necessary for automated model-based quantity take-off. To be read in conjunction with the cost planning geometry guideline and reinforcing modeling practices guide". |
-| Purpose     | A short one sentence summary of what the IDS achieves                                                                                                                                                                                                                                                                                                                                    | "Minimum requirements for all OpenBIM projects for basic coordination" or "Property requirements for accurate model-based cost planning".                                                                                                                                                                                                                                                                                                                                                                                |
-| Milestone   | Which project milestone the IDS should be satisfied in                                                                                                                                                                                                                                                                                                                                   | "Design", "Construction", or "Comissioning"                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+| Description | One or more sentences that further elaborate on a description who the IDS might be for, why it is created, what projects it might apply to, and so on.  | "Minimum requirements for all OpenBIM projects to ensure basic coordination and data scheduling can be done by all stakeholders. Expected to be run prior to model sharing and is a requirement for all project milestones." or "Specifies required properties that have a large impact on the accuracy of cost estimation and quantities that are necessary for automated model-based quantity take-off. To be read in conjunction with the cost planning geometry guideline and reinforcing modeling practices guide". |
+| Purpose     | Why the information is needed. | "quantity take off", "accessibility analysis", "clash detection", "coordination", "cost estimation".  |
+| Milestone   | Delivery milestone when the information is needed. | "Schematic Design", "Construction", "Commissioning", "RIBA Stage 3", "As-built", "Planning", "350", "400". |
 
 ## Specification metadata