diff --git a/README.md b/README.md
index fb88d40f..06aad2dd 100644
--- a/README.md
+++ b/README.md
@@ -29,8 +29,8 @@ _ttconv_ works by mapping the input document, whatever its format, into an
internal canonical model, which is then optionally transformed by document
filters, and finally mapped to the format of the output document is derived. The
canonical model closely follows the [TTML 2](https://www.w3.org/TR/ttml2) data
-model, as constrained by the [IMSC 1.1 Text
-Profile](https://www.w3.org/TR/ttml-imsc1.1/#text-profile) specification.
+model, as constrained by the [IMSC 1.3 Text
+Profile](https://www.w3.org/TR/ttml-imsc1.3/#profiles) specification.
## Online demo
@@ -44,7 +44,7 @@ suggestions/contributions are welcome.
### Input Formats
* [CTA 608/.scc](https://en.wikipedia.org/wiki/EIA-608)
-* [IMSC 1.1 Text Profile/.ttml](https://www.w3.org/TR/ttml-imsc1.1/#text-profile)
+* [IMSC 1.3 Text Profile](https://www.w3.org/TR/ttml-imsc1.3/#profiles)
* [EBU STL](https://tech.ebu.ch/docs/tech/tech3264.pdf)
* [SubRip/.srt](https://en.wikipedia.org/wiki/SubRip)
* [WebVTT](https://www.w3.org/TR/webvtt1/)
@@ -52,7 +52,7 @@ suggestions/contributions are welcome.
### Output Formats
* [SubRip/.srt](https://en.wikipedia.org/wiki/SubRip)
-* [IMSC 1.1 Text Profile/.ttml](https://www.w3.org/TR/ttml-imsc1.1/#text-profile)
+* [IMSC 1.3 Text Profile](https://www.w3.org/TR/ttml-imsc1.3/#profiles)
* [WebVTT](https://www.w3.org/TR/webvtt1/)
* [CTA 608/.scc](https://en.wikipedia.org/wiki/EIA-608)
diff --git a/doc/data_model.md b/doc/data_model.md
index 9f5c7321..7dee9e6b 100644
--- a/doc/data_model.md
+++ b/doc/data_model.md
@@ -2,7 +2,8 @@
## Overall
-The canonical model closely follows the [TTML 2](https://www.w3.org/TR/ttml2) data model, as constrained by the [IMSC 1.1 Text Profile](https://www.w3.org/TR/ttml-imsc1.1/#text-profile) specification. This includes both the static structure of the model as well as temporal, layout and style processing. The objective is for a valid IMSC 1.1 Text Profile document to be mapped into a canonical model instance such that presenting instance results in the same outout as the input IMSC document.
+The canonical model closely follows the [TTML 2](https://www.w3.org/TR/ttml2) data model, as constrained by the [IMSC 1.3 Text
+Profile](https://www.w3.org/TR/ttml-imsc1.3/#profiles) specification. This includes both the static structure of the model as well as temporal, layout and style processing. The objective is for a valid IMSC 1.3 Text Profile document to be mapped into a canonical model instance such that presenting instance results in the same outout as the input IMSC document.
The canonical model is specified in `ttconv.model`.
diff --git a/doc/imsc_reader.md b/doc/imsc_reader.md
index ae31a23d..97ffc679 100644
--- a/doc/imsc_reader.md
+++ b/doc/imsc_reader.md
@@ -7,8 +7,10 @@ preserve rendering fidelity but not necessarily structure, e.g. referential styl
## Limitations
-The IMSC reader primarily converting TTML documents that conform to the [IMSC 1.1 Text Profile](https://www.w3.org/TR/ttml-imsc1.1/#text-profile), with a few exceptions:
+The IMSC reader primarily converting TTML documents that conform to the [IMSC 1.3 Text
+Profile](https://www.w3.org/TR/ttml-imsc1.3/#profiles), with a few exceptions:
* `ttp:timeBase="smpte"` is supported with `ttp:dropMode="dropNTSC" | "nonDrop"` (the timecode timestamp are converted to media time in the model)
+* the following features introduced in IMSC 1.2 are not supported: `#font`, `#resources` and `#source`.
## Usage
@@ -27,7 +29,7 @@ doc = imsc_reader.to_model(xml_doc)
The input XML document is traversed using depth-first search (DFS). Each XML element encountered is processed using the `from_xml()`
method of the corresponding class in `ttconv/imsc/elements.py`. For example,
-`ttconv.imsc.elements.PElement.from_xml()` is applied to each `` element. Since the data model is a subset of the IMSC 1.1 model,
+`ttconv.imsc.elements.PElement.from_xml()` is applied to each `
` element. Since the data model is a subset of the IMSC 1.3 model,
additional parsing state is preserved across calls to `from_xml()` by associating each parsed XML element in an instance of the
`ttconv.imsc.elements.TTMLElement.ParsingContext` structure and its subclasses.
diff --git a/doc/references.md b/doc/references.md
index 36fb61c4..789f35d4 100644
--- a/doc/references.md
+++ b/doc/references.md
@@ -10,8 +10,8 @@
| [Line 21 Data Services (ANSI/CTA-608-E S-2019)](https://shop.cta.tech/products/line-21-data-services) | Mapping of SCC into the data model |
| [ST 2052-1:2013 - SMPTE Standard - Timed Text Format (SMPTE-TT)](https://ieeexplore.ieee.org/document/7291854) | Mapping of SCC into the data model |
| [ST 2052-1:2013 - SMPTE Standard - Timed Text Format (SMPTE-TT)](https://ieeexplore.ieee.org/document/7291854) | Mapping of SCC into the data model |
-| [IMSC 1.1](https://www.w3.org/TR/ttml-imsc1.1/) | Basis for the data model and specification for the IMSC format |
-| [TTML 2](https://www.w3.org/TR/ttml2/) | Parent of IMSC 1.1 |
+| [IMSC 1.3](https://www.w3.org/TR/ttml-imsc1.3/) | Basis for the data model and specification for the IMSC format |
+| [TTML 2](https://www.w3.org/TR/ttml2/) | Parent of IMSC 1.3 |
| [47 CFR 15.119](https://www.govinfo.gov/app/details/CFR-2010-title47-vol1/CFR-2010-title47-vol1-sec15-119) | Closed caption decoder requirements for analog television receivers |
| [SCC](https://docs.inqscribe.com/2.2/format_scc.html) | Specification of the SCC file format |
| [EBU Tech 3264](https://tech.ebu.ch/docs/tech/tech3264.pdf) | Specification of the EBU Subtitling data exchange format |