STC Version 1.20 and LinearSTC

[Arnold Rots]

I have posted STC version 1.20 at the IVOA documents repository.
Associated with the Working Draft are the STC-XML document, the
three schema files, and a new document: Linear STC.
I append the list of changes from version 1.10

Most of the changes will not be very noticeable but Linear STC might
be of special interest to VOQL and Registries.  It is posted as a Note:

	http://www.ivoa.net/Documents/latest/LinearSTC.html

Linear STC is a "command line" implementation of STC, with an eye
toward ADQL, Dublin Core, and human readability; read the first three
pages of the document if you are interested.

Cheers,

  - Arnold

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Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots at head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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Appendix D  -  Changes from Previous Versions

>From V1.10 to V1.20:

    * Distinguished LSRK and LSRD; replaced SUPER_GALACTIC_CENTER by
LOCAL_GROUP_CENTER 
    * Added Box shape to Region
    * Require polygon sides to be less than 180°; added explanation on
defining inside and outside 
    * Added LinearSTC implementation
    * Subtle changes to the schemata to force validation under
Xerces-J2; this did not change anything but made the schemata a little
uglier 
    * Changed units "micron" and "A" to "um" and "Angstrom",
respectively, consistent with the FITS standard 
    * Added timescale TEB, with references
    * Added warning on use of ISOTime and restricted its use explicitly
    * Added an explicit definition of Position Angle; in the XML
implementation it is now an element, rather than an attribute (see,
e.g., Ellipse) 
    * Added a reference spheroid to GEO_D, changed GEO to GEO_C
    * Added an explicit discussion of planetographic and
planetocentric coordinate systems, with references, as well as a
discussion of right-handed and left-handed systems 
    * Removed GEOGRAPHIC CoordFlavor, replacing it by 3-dimensional
SPHERICAL, and added POLAR 


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Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots at head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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