d:dt4dtd
dt4dtd
13 January 2000
NOTE
Datatypes for DTDs (DT4DTD)
https://www.w3.org/TR/dt4dtd




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d:dt4dtd-20000113
dt4dtd-20000113
13 January 2000
NOTE
Datatypes for DTDs (DT4DTD)
https://www.w3.org/TR/2000/NOTE-dt4dtd-20000113
https://www.w3.org/TR/2000/NOTE-dt4dtd-20000113



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d:dtmf
DTMF
1 November 1988
In force
Q.23 : Technical features of push-button telephone sets
https://www.itu.int/rec/T-REC-Q.23/en




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