Standard Generalized Markup Language
The Standard Generalized Markup Language (SGML; ISO 8879:1986) is for defining generalized markup languages for documents. ISO 8879 Annex A.1 defines generalized markup:
HTML was theoretically an example of an SGML-based language until HTML 5, which admits that browsers cannot parse it as SGML (for compatibility reasons) and codifies exactly what they must do instead.
DocBook SGML and LinuxDoc are better examples, as they were used almost exclusively with actual SGML tools.
Standard versions
SGML is an ISO standard: "ISO 8879:1986 Information processing – Text and office systems – Standard Generalized Markup Language (SGML)", of which there are three versions:
Podcasts:
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by Jonathan Coulton
Skymall
by: Jonathan CoultonO'Hare is nice this time of year
I check my bags, and find my
Seat and buy a beer
And settle in
Such is my life here on the road
Now my seatback is up, tray table stowed
And there's nothing to do
I gotta get myself through
So I am shopping at Skymall
That five-mile-high mall
That always has just what I need
When I get to the gate
And remember too late
I should've brought
Something to read
I'm OK...
'Cause I know that I'm gonna shop
Skymall!
I bought a pair of bonsai trees
I bought a big fake rock
Where I can hide my keys
From everyone
And I imagine what all my friends would say
To see this lovable Santa dance and sway
To my favorite songs
My favorite holiday songs
And I am shopping at Skymall
That five-mile-high mall
That always has just what I need
When I get to the gate and remember too late
I should've brought something to read
I'm OK... 'Cause I know that I'm gonna shop Skymall!
In Cleveland I bought a replica
Of the sword that was broken
And then somewhere above Detroit
Some 'successories' that say "Lead with vision"
I love you best when I'm away
And while I'm out here I look
Forward to the day When I come home.
'Cause there's something special waiting there
It's a whimsical statue of a bear
That holds a bottle of wine
But please don't touch it it's mine....
Because I bought it at Skymall
That five-mile-high mall
That always has just what I need
When I get to the gate and remember too late
I should've brought something to read