| internal | value defined in-line |
| <!ENTITY name "value" > | |
| <!ENTITY % name "value" > | |
| external | value stored in an external file |
| <!ENTITY name external-id> | |
| <!ENTITY % name external-id> | |
|
<!ENTITY sig "Me Name @ Some address">
<!ENTITY ssig SYSTEM "sig.txt"> <!ENTITY psig PUBLIC "foo" "sig.txt"> ... <doc> &sig; &ssig; &psig; </doc> | sig.txt:
Me Name @ Some address |