Update README.md (#7)

* Update README.md Updated README to mention the TDF XML format, and to provide a contact for those who are seeking to learn more about implementations around it. * Update README.md Co-authored-by: Ben Leggett <[email protected]> Co-authored-by: Ben Leggett <[email protected]>
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 # Trusted Data Format Specification
 
-Trusted Data Format (TDF) is an Open, Interoperable, JSON encoded data format for implementing Data Centric Security for objects (such as files or emails). This repository specifies the protocols and schemas required for TDF operation. Versioning of this spec follows the [Semver standard](https://semver.org/). The latest major version of the TDF spec and corresponding protocol is TDF 3.x.x.
+Trusted Data Format (TDF) is an Open, Interoperable data format for implementing Data Centric Security for objects (such as files or emails). This repository specifies the protocols and schemas required for TDF operation. Versioning of this spec follows the [Semver standard](https://semver.org/).
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+OpenTDF derives its modern JSON-encoded format from the [TDF XML Specification](https://www.dni.gov/index.php/who-we-are/organizations/ic-cio/ic-cio-related-menus/ic-cio-related-links/ic-technical-specifications/trusted-data-format). If you are interested in interoperability between OpenTDF and Base TDF XML or community-specific implementations, please [contact us](mailto:[email protected]). 
 
 ## Documentation
 * [Schema](schema/) - Schema definitions for common TDF data objects.