STIX 2.0.1 released.

README.md

@@ -1,20 +1,212 @@
 # stixfonts
 OpenType Unicode fonts for Scientific, Technical, and Mathematical texts
 
-## Description
+## Overview
 
-See http://www.stixfonts.org/ for a description of the the STIX Fonts
-project.
+* See https://www.stixfonts.org/ for background on the the STIX Fonts
+  project.
 
-Download the [current version](zipfiles/STIXv2.0.0.zip) of the OTF,
-WOFF, and WOFF2 files in a zip archive.
+* Download the [current version](zipfiles/STIXv2.0.1.zip) of the OTF,
+  WOFF, and WOFF2 files in a zip archive.
 
-See the code charts for the [text](docs/charts/StixTwoRegular.pdf) and
-[math](docs/charts/StixTwoMath.pdf) for an overview of the Unicode
-blocks supported by the fonts.
+* View [code charts](docs/charts) for the
+  * [Math](docs/charts/StixTwoMath.pdf),
+  * [Regular text](docs/charts/StixTwoRegular.pdf),
+  * [Italic](docs/charts/StixTwoItalic.pdf),
+  * [Bold](docs/charts/StixTwoBold.pdf), and
+  * [Bold Italic](docs/charts/StixTwoBoldItalic.pdf)
+  fonts.
 
-The STIX Two fonts are a set of OpenType fonts and are meant to be
-used in that format.  For the benefit of LaTeX users who are unable to
-use XeTeX or luaTeX, we have also provided version 2.0.0 of the STIX
-fonts as a [set of TFM files and Type 1 fonts](Type1).  These are also
-available as a separate [zip file](zipfiles/STIXv2.0.0-type1.zip).
+### Type 1 fonts (STIX 2.0.0 only)
+
+The STIX Two fonts are OpenType fonts and are meant to be used in that
+format.  For the benefit of LaTeX users who are unable to use XeTeX or
+luaTeX, we have also provided version 2.0.0 of the STIX fonts as a
+[set of TFM files and Type 1 fonts](Type1).  These are also available
+as a separate [zip file](zipfiles/STIXv2.0.0-type1.zip).
+
+Note that **no further updates** are planned to the Type 1
+distribution; future development efforts will focus on improving the
+OpenType fonts.  Patches to the existing Type 1 distribution are
+welcome and, pending review, will be incorporated into the
+distribution.
+
+## About the STIX fonts.
+
+The Scientific and Technical Information eXchange (STIX) fonts are
+intended to meet the demanding needs of authors, publishers, printers,
+and others in the scientific, medical, and technical fields.  They
+combine a comprehensive Unicode-based collection of mathematical
+symbols and alphabets with a set of text faces suitable for
+professional publishing.  They are available royalty-free under the
+[SIL Open Font License](docs/STIX_2.0.1_license.pdf).
+
+Version 2 of the STIX fonts, now known as “STIX Two”, is a thorough
+revision of version 1 undertaken by the renowned type house [Tiro
+Typeworks](https://tiro.com).  The STIX Two fonts consist of four text
+fonts (Regular, Italic, Bold, and Bold Italic) and one Math font.
+Together, they provide a uniform set of fonts that can be used
+throughout the production process, whether that be a traditional
+print-only process, an entirely electronic one, or a combination of
+the two.
+
+The [STIX project](https://www.stixfonts.org/) began through the joint
+efforts of
+the [American Mathematical Society](https://www.ams.org/) (AMS),
+the [American Institute of Physics](https://www.aip.org/) (AIP),
+the [American Physical Society](https://www.aps.org/) (APS),
+the [American Chemical Society](https://www.acs.org/) (ACS),
+the [Institute of Electrical and Electronic](https://www.ieee.org/) Engineers (IEEE),
+and [Elsevier](https://www.elsevier.com/).
+These companies are collectively known as the STI Pub companies.
+
+### A Fresh Take on Times Roman
+
+The original version of STIX was based on Times Roman, which has now
+been updated for the digital age.
+
+As is well known, Times Roman was originally intended for printing the
+*London Times*.  What is not generally appreciated is that the
+production quality of the *Times* was atypically high: It was printed
+on unusually high-quality paper on presses that operated more slowly
+than most newspaper presses.  This allowed for the design of a
+typeface that could exploit this level of care: serifs could be much
+finer and counters (enclosed areas such as that in the lowercase *e*)
+could be much smaller than in other newspaper typefaces.  These
+features of the font have not always fared well in less exacting
+environments.  At the same time, a notable quirk of the Times Roman
+family is that the bold font is, in many respects, strikingly
+dissimilar to the roman font.
+
+Tiro Typeworks explain their approach to updating the Times Roman
+basis of STIX as follows:
+
+> “Our principal goal in approaching STIX Two was to address several
+> inherent deficiencies in the Times New Roman model as well as expand
+> the typographic features. This process necessarily involved
+> diverging somewhat from Times as familiar to people who have only
+> known the common digital versions, while simultaneously restoring to
+> that typeface aspects of the size-appropriate design characteristics
+> that made it so successful in newspaper, book, and journal
+> publishing in it’s metal type incarnation. The essential
+> ‘Times-ness’ remains, but are with greater harmonisation of style
+> across the family.
+> 
+> “Most digital versions of Times have been based on an optical size
+> model that appears too light and fine when scaled down to typical
+> text sizes. In the design of STIX Two, we went back to specimens of
+> size-specific designs from the metal era, and adapted proportions,
+> weights, and spacing of the 10pt and 12pt designs. The oft-noted
+> mismatch between the style of different weights of Times has been
+> resolved with a new bold design that matches the construction of the
+> regular weight.”
+
+### Font implementation decisions
+
+* The STIX fonts do not contain fixed-width or sans serif text faces.
+
+* The sans serif, fraktur, script, etc., alphabets in Plane 1
+  (U+1D400-U+1D4FF) are intended to be used only as technical symbols.
+
+* These fonts are designed to support left-to-right typesetting in
+  Latin-based scripts, with additional support for Greek and Cyrillic
+  text.  Extensions to support other writing directions have been
+  considered, but are currently deemed to be outside the scope of the
+  STIX project.
+
+### Note to TeX users
+
+These fonts have been tested with both
+[XeTeX](http://xetex.sourceforge.net/)
+and
+[luaTeX](http://www.luatex.org/)
+with good results.  For best results, XeTeX users will want to use
+version 0.99999 or later of XeTeX, which ships with
+[TeXLive 2018](https://www.tug.org/texlive/).
+This version fixes a number of bugs that were present in earlier
+versions.  Our thanks go out to Jonathan Kew and Khaled Hosny for
+their generous help in identifying and fixing these bugs.  LaTeX users
+should also make sure they have the latest version of the
+[amsmath package](https://ctan.org/pkg/amsmath).
+
+## Summary of OpenType Features and Scripts
+
+Further details these features can be found in the [font charts](docs/charts).
+
+The four text fonts implement the following OpenType script tags:
+
+    Regular   Bold      Italic    BoldItalic
+
+    DFLT      DFLT      DFLT      DFLT          Default
+
+    cyrl      cyrl      cyrl      cyrl          Cyrillic
+                        cyrl.MKD  cyrl.MKD      Cyrillic/Macedonian
+                        cyrl.SRB  cyrl.SRB      Cyrillic/Serbian
+
+    grek      grek      grek      grek          Greek
+
+    latn      latn      latn      latn          Latin
+    latn.ROM  latn.ROM  latn.ROM  latn.ROM      Latin/Romanian        
+    latn.TRK  latn.TRK  latn.TRK  latn.TRK      Latin/Turkish
+
+and the following features
+
+    c2sc    Small Capitals from Capitals
+    case    Case-Sensitive Forms
+    ccmp    Glyph Composition/Decomposition
+    dnom    Denominators
+    frac    Fractions
+    kern    Kerning
+    liga    Standard Ligatures -- latn only
+    locl    Localized Forms    -- latn.ROM and Italic/BoldItalic cyrl.MKD only
+    numr    Numerators
+    onum    Oldstyle Figures
+    pnum    Proportional Figures
+    smcp    Small Capitals
+    subs    Subscript
+    sups    Superscript
+
+All four text fonts also support the following Character Variants:
+
+    cv01    U+019B Lambda with horizontal, not slanted stroke -- latn only
+    cv02    U+0264 Rams horn with serifs -- latn only
+    cv03    U+2423 OPEN BOX curved instead of straight
+
+In addition, the Italic and BoldItalic faces support the following
+Stylistic Variants:
+
+    ss01    Replace two-story g by hooked g      -- Italic/BoldItalic only
+    ss02    Upright parens, brackets, and braces -- Italic/BoldItalic only
+
+STIX Two Math implements the following font features:
+
+    ccmp    Glyph Composition/Decomposition
+    dtls    Dotless forms of i and j
+    flac    Flattened accents
+    ssty    Math Script style alternates
+
+and the following Character Variant (note the different meaning
+compared to the text fonts):
+
+    cv03    Replace U2205 EMPTY SET by an oblate form
+
+and the following Stylistic Sets (again, note that ss01 and ss02 have
+different meanings compared to the text fonts):
+
+    ss01    Stylistic Set 1 -- Math chancery to roundhand (\mathcal -> \mathscr)
+    ss02    Stylistic Set 2 -- Alternate italic forms: g, u, v, w, z
+    ss03    Stylistic Set 3 -- Horizontal crossbar variants
+    ss04    Stylistic Set 4 -- Minute, second and primes to long variants
+    ss05    Stylistic Set 5 -- Short arrow variants
+    ss06    Stylistic Set 6 -- Short/narrow variants
+    ss07    Stylistic Set 7 -- Alternate math symbols (product, summation, etc)
+    ss08    Stylistic Set 8 -- Upright integral variants; XITS compatible
+    ss09    Stylistic Set 9 -- Vertical slash variants; XITS compatible
+    ss10    Stylistic Set 10 -- Diagonal greater/lesser combination variants
+    ss11    Stylistic Set 11 -- Long slash not-equal combination variants
+    ss12    Stylistic Set 12 -- Low contrast (sans-like) variants
+    ss13    Stylistic Set 13 -- Horizontally flipped sine wave glyph
+    ss14    Stylistic Set 14 -- Tall variants
+    ss15    Stylistic Set 15 -- Slab serif symbol variants
+    ss16    Stylistic Set 16 -- Circled operator variants
+    ss20    Stylistic Set 20 -- Miscellaneous variants