Update README.md

Reflect progress and likely future work

README.md

@@ -2,15 +2,18 @@
 
 This repo is for the OGC Temporal Domain Working Group to develop an Abstract Specification for Time to be part of the [Abstract Specifications](https://www.ogc.org/docs/as), described in more detail in [OGC Abstract Specification Topic 0](https://docs.ogc.org/as/04-084r4/04-084r4.html) 
 
-The current OGC standards generally refer to the ISO documents such as [ISO 19108](https://www.iso.org/standard/26013.html), and their freely available OGC equivalents, such as [Abstract Specification Topic 2 Referencing by Coordinates](https://docs.opengeospatial.org/as/18-005r4/18-005r4.html#44).
+The current OGC standards generally refer to the ISO documents such as [ISO 19108](https://www.iso.org/standard/26013.html), [ISO 19111](https://www.iso.org/standard/74039.html), and their freely available OGC equivalents, such as [Abstract Specification Topic 2 Referencing by Coordinates](https://docs.opengeospatial.org/as/18-005r4/18-005r4.html#44).
 
 Much effort over decades has gone into establishing complex structures to represent calendar based time, such as the ISO8601 notation, and many date-time schemas. Because of this effort, many people use calendar based "coordinates", with the attendant ambiguities, imprecision and inappropriate scope.
 
 The aim of the document is to establish a clear terminology, so that people are clearly aware of the advantages and disadvantages of adopting a particular technological approach and then perhaps help build better interoperable systems.
 
+Further work is to develop and recommend best practices for handling temporal concepts, coordinates, attributes and properties in various technical environments.
+
 The current draft documents available from the following locations:
 
-* Charter (draft) in [HTML](https://htmlpreview.github.io/?https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/Charter/document.html), [PDF](https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/Charter/document.pdf), and [Word](https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/Charter/document.doc) formats.
+* Charter for the Temporal Domain Working Group as a [PDF](Temporal-Abstract-Spec/Best-Practice/Temporal_Domain_WG_Charter_V0.7.pdf). The approved Charter workplan includes development of Best Practices and the Abstract Specification Topic. 
+* Charter (draft) for a Temporal Standard Working Group in [HTML](https://htmlpreview.github.io/?https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/Charter/document.html), [PDF](https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/Charter/document.pdf), and [Word](https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/Charter/document.doc) formats. This is in case any future temporal standards and documents are developed that are not in the scope of the existing Charter.
 * Abstract Specification (draft) in [HTML](https://htmlpreview.github.io/?https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/23-049/23-049.html), [PDF](https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/23-049/23-049.pdf), and [Word](https://github.com/opengeospatial/Temporal-Abstract-Spec/blob/master/23-049/23-049.doc) formats.
 
 ## About this document