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<!-- Weave of 'The Provision Relation' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../inform7n.html" > Inform7< / a > < / li > < li > < a href = "index.html" > knowledge< / a > < / li > < li > < a href = "index.html#3" > Chapter 3: Properties< / a > < / li > < li > < b > The Provision Relation< / b > < / li > < / ul > < / div >
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< p class = "purpose" > To define the provision relation, which determines which properties can be held by which objects.< / p >
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< ul class = "toc" > < li > < a href = "3-tpr.html#SP2" > § 2. Family< / a > < / li > < li > < a href = "3-tpr.html#SP3" > § 3. Initial stock< / a > < / li > < li > < a href = "3-tpr.html#SP4" > § 4. Typechecking< / a > < / li > < li > < a href = "3-tpr.html#SP5" > § 5. Assertion< / a > < / li > < li > < a href = "3-tpr.html#SP6" > § 6. Compilation< / a > < / li > < li > < a href = "3-tpr.html#SP7" > § 7. Problem message text< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > Assertions assigning properties ("A scene has a time called the expected
duration") generate propositions which assert that a subject, here "scene",
provides a property, here "expected duration". The relation needed is:
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > R_provision< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. Family. < / b > There is just one provision relation, which is the only member of its family.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > bp_family< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > ProvisionRelation::start< / span > < button class = "popup" onclick = "togglePopup('usagePopup1')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup1" > Usage of < span class = "code-font" > < span class = "function-syntax" > ProvisionRelation::start< / span > < / span > :< br / > Knowledge Module - < a href = "1-km.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > BinaryPredicateFamilies::new< / span > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > STOCK_BPF_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tpr.html#SP3" class = "function-link" > < span class = "function-syntax" > ProvisionRelation::stock< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > TYPECHECK_BPF_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tpr.html#SP4" class = "function-link" > < span class = "function-syntax" > ProvisionRelation::typecheck< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ASSERT_BPF_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tpr.html#SP5" class = "function-link" > < span class = "function-syntax" > ProvisionRelation::assert< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > SCHEMA_BPF_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "3-tpr.html#SP6" class = "function-link" > < span class = "function-syntax" > ProvisionRelation::schema< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > DESCRIBE_FOR_INDEX_BPF_MTID< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < a href = "3-tpr.html#SP7" class = "function-link" > < span class = "function-syntax" > ProvisionRelation::describe_for_index< / span > < / a > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. Initial stock. < / b > There's just one relation of this kind, and it's hard-wired in. The terms are
given a very broad range of what they can accept.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > ProvisionRelation::stock< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > ProvisionRelation::stock< / span > < / span > :< br / > < a href = "3-tpr.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp_family< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > self< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > n< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > n< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > R_provision< / span > < span class = "plain-syntax" > =< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > BinaryPredicates::make_pair< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > provision_bp_family< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > BPTerms::new< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > BPTerms::new< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ),< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "provides"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PreformUtilities::wording< / span > < span class = "plain-syntax" > (< / span > < span class = "function-syntax" > < relation-names> < / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > PROVISION_RELATION_NAME< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > BinaryPredicates::set_index_details< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > R_provision< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "value"< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "property"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. Typechecking. < / b > Any property can in principle be assigned to any inference subject, so there's
really no restriction on the left term. The right term, of course, has to be
a property.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > ProvisionRelation::typecheck< / span > < button class = "popup" onclick = "togglePopup('usagePopup3')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup3" > Usage of < span class = "code-font" > < span class = "function-syntax" > ProvisionRelation::typecheck< / span > < / span > :< br / > < a href = "3-tpr.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp_family< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > self< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > kinds_required< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > tc_problem_kit< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tck< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Kinds::get_construct< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > [1]) == < / span > < span class = "identifier-syntax" > CON_property< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ALWAYS_MATCH< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Problems::quote_kind< / span > < span class = "plain-syntax" > (4, < / span > < span class = "identifier-syntax" > kinds_of_terms< / span > < span class = "plain-syntax" > [1]);< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > StandardProblems::tcp_problem< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_BadProvides< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > tck< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "that asks whether something provides something, and in Inform 'to provide' "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "means that an object (or value) has a property attached - for instance, "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "containers provide the property 'carrying capacity'. Here, though, we have "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "%4 rather than the name of a property."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NEVER_MATCH< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. Assertion. < / b > If we assert that, say, vehicles provide "colour", then we are implicitly
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enabling adjectives formed from its enumerated instances — say, "green" or
"blue" — can apply to vehicles, so we must make sure any such meanings are
defined.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > ProvisionRelation::assert< / span > < button class = "popup" onclick = "togglePopup('usagePopup4')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup4" > Usage of < span class = "code-font" > < span class = "function-syntax" > ProvisionRelation::assert< / span > < / span > :< br / > < a href = "3-tpr.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp_family< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > self< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inference_subject< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > infs0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec0< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inference_subject< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > infs1< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec1< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > property< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Rvalues::to_property< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec1< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > infs0< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "4-pp.html#SP3" class = "function-link" > < span class = "function-syntax" > PropertyPermissions::grant< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > infs0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ins.html#SP8" class = "function-link" > < span class = "function-syntax" > Instances::update_adjectival_forms< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. Compilation. < / b > Run-time is too late to change which objects provide what, so this relation
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can't be changed at compile time.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > ProvisionRelation::schema< / span > < button class = "popup" onclick = "togglePopup('usagePopup5')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup5" > Usage of < span class = "code-font" > < span class = "function-syntax" > ProvisionRelation::schema< / span > < / span > :< br / > < a href = "3-tpr.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp_family< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > self< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > task< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > annotated_i6_schema< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > asch< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > task< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > TEST_ATOM_TASK< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > RTProperties::test_provision_schema< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > asch< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP7" class = "paragraph-anchor" > < / a > < b > § 7. Problem message text. < / b > Nothing special is needed here.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > ProvisionRelation::describe_for_index< / span > < button class = "popup" onclick = "togglePopup('usagePopup6')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup6" > Usage of < span class = "code-font" > < span class = "function-syntax" > ProvisionRelation::describe_for_index< / span > < / span > :< br / > < a href = "3-tpr.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp_family< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > self< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "provision"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "3-vp.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-km.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-ins.html" > 2< / a > < / li > < li class = "progresscurrentchapter" > 3< / li > < li class = "progresssection" > < a href = "3-prp.html" > prp< / a > < / li > < li class = "progresssection" > < a href = "3-ep.html" > ep< / a > < / li > < li class = "progresssection" > < a href = "3-epa.html" > epa< / a > < / li > < li class = "progresssection" > < a href = "3-vp.html" > vp< / a > < / li > < li class = "progresscurrent" > tpr< / li > < li class = "progresssection" > < a href = "3-spr.html" > spr< / a > < / li > < li class = "progresssection" > < a href = "3-spr2.html" > spr2< / a > < / li > < li class = "progresssection" > < a href = "3-msr.html" > msr< / a > < / li > < li class = "progresssection" > < a href = "3-ma.html" > ma< / a > < / li > < li class = "progresssection" > < a href = "3-cr.html" > cr< / a > < / li > < li class = "progresschapter" > < a href = "4-is.html" > 4< / a > < / li > < li class = "progresschapter" > < a href = "5-inf.html" > 5< / a > < / li > < li class = "progressnext" > < a href = "3-spr.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >