Schema element "b:Expression"
Read the the explanation
for a full overview.
Definitions
<simpleType name="Expression">
<restriction base="string" />
</simpleType>
Description
The expression results in any kind of computed value.
Read the details.
The syntax of conditions mimics any C-like language. You may use
other defined expressions by name. Also, the service may offer additional
names which produce values.
Services MAY decide to refuse all expressions which it has not
predefined itself. Those are run-time errors. Also, they MAY refuse
expressions which it cannot be handled fast enough. Changing the
accepted syntax must be reflected in —at least a minor—
version increment and be documented.
Discussion
no pre-parsed expressions
Many (XML) schemas bend themselves in strange and complex ways to
store a parsed version if expressions. That makes using them needlessly
complex: a simple expression parser on the receiving side makes it easier
to configure to receive data.
mark@overmeer.net
Web-pages generated on 2023-12-19
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