Exemple: <constraint> (constraint rules)
These search results reproduce every example of the use of <constraint> in the Guidelines, including all localised and translated versions. In some cases, the examples have been drawn from discussion of other elements in the Guidelines and illustrating the use of <constraint> is not the main focus of the passage in question. In other cases, examples may be direct translations of each other, and hence identical from the perspective of their encoding.
22 Documentation Elements
22.4.4.2 Additional constraints
<constraintSpec ident="activemutual" scheme="isoschematron">
<desc>Check mutually incompatible attributes</desc>
<constraint>
<sch:report test="@active and @mutual">Only one of the attributes
'active' and 'mutual' may be supplied</sch:report>
<sch:report test="@passive and not(@active)">the attribute 'passive'
may be supplied only if the attribute 'active' is
supplied</sch:report>
</constraint>
</constraintSpec>
<desc>Check mutually incompatible attributes</desc>
<constraint>
<sch:report test="@active and @mutual">Only one of the attributes
'active' and 'mutual' may be supplied</sch:report>
<sch:report test="@passive and not(@active)">the attribute 'passive'
may be supplied only if the attribute 'active' is
supplied</sch:report>
</constraint>
</constraintSpec>
22.4.4.2 Additional constraints
<constraintSpec ident="alt" scheme="isoschematron">
<constraint>
<sch:ns prefix="tei" uri="http://www.tei-c.org/ns/1.0"/>
<sch:pattern id="Alt tags">
<sch:rule context="tei:figure">
<sch:report test="not(tei:figDesc or tei:head)"> You should
provide information in a figure from which
we can construct an alt attribute in HTML </sch:report></sch:rule></sch:pattern>
</constraint>
</constraintSpec>
<constraint>
<sch:ns prefix="tei" uri="http://www.tei-c.org/ns/1.0"/>
<sch:pattern id="Alt tags">
<sch:rule context="tei:figure">
<sch:report test="not(tei:figDesc or tei:head)"> You should
provide information in a figure from which
we can construct an alt attribute in HTML </sch:report></sch:rule></sch:pattern>
</constraint>
</constraintSpec>
22.4.4.2 Additional constraints
<constraintSpec ident="tables" scheme="isoschematron">
<constraint>
<sch:ns prefix="tei" uri="http://www.tei-c.org/ns/1.0"/>
<sch:pattern id="Tables">
<sch:rule context="tei:table">
<sch:assert test="tei:head">A <table> should have a caption, using a <head> element</sch:assert>
<sch:report test="parent::tei:body">Do not use tables to lay out the document body</sch:report></sch:rule></sch:pattern>
</constraint>
</constraintSpec>
<constraint>
<sch:ns prefix="tei" uri="http://www.tei-c.org/ns/1.0"/>
<sch:pattern id="Tables">
<sch:rule context="tei:table">
<sch:assert test="tei:head">A <table> should have a caption, using a <head> element</sch:assert>
<sch:report test="parent::tei:body">Do not use tables to lay out the document body</sch:report></sch:rule></sch:pattern>
</constraint>
</constraintSpec>
22.4.4.2 Additional constraints
<constraintSpec ident="subclauses" scheme="isoschematron">
<constraint>
<sch:rule context="tei:div">
<sch:assert test="not(tei:div) or count(tei:div)>1">a division must contain
at least two subdivisions</sch:assert></sch:rule>
</constraint>
</constraintSpec>
<constraint>
<sch:rule context="tei:div">
<sch:assert test="not(tei:div) or count(tei:div)>1">a division must contain
at least two subdivisions</sch:assert></sch:rule>
</constraint>
</constraintSpec>
22.4.4.2 Additional constraints
<constraintSpec ident="introtitle" scheme="isoschematron">
<constraint>
<sch:assert
test="tei:fileDesc/tei:titleStmt/tei:title[@type='introductory']"> an introductory component of the title is expected
</sch:assert>
</constraint>
</constraintSpec>
<constraintSpec ident="maintitle" scheme="isoschematron">
<constraint>
<sch:assert
test="tei:fileDesc/tei:titleStmt/tei:title[@type='main']"> a main title must be supplied
</sch:assert>
</constraint>
</constraintSpec>
<constraint>
<sch:assert
test="tei:fileDesc/tei:titleStmt/tei:title[@type='introductory']"> an introductory component of the title is expected
</sch:assert>
</constraint>
</constraintSpec>
<constraintSpec ident="maintitle" scheme="isoschematron">
<constraint>
<sch:assert
test="tei:fileDesc/tei:titleStmt/tei:title[@type='main']"> a main title must be supplied
</sch:assert>
</constraint>
</constraintSpec>
<constraintSpec ident="local" scheme="private">
<constraint>
(output = (ident(title) ident(author) "You must supply a title or an author"))
</constraint>
</constraintSpec>
<constraint>
(output = (ident(title) ident(author) "You must supply a title or an author"))
</constraint>
</constraintSpec>
<constraintSpec ident="demo-c1" scheme="isoschematron">
<desc>Enforce the presence of the <att>spanTo</att> attribute</desc>
<constraint>
<sch:assert test="@spanTo">The spanTo= attribute of <sch:name/>
is required.</sch:assert>
</constraint>
</constraintSpec>
<desc>Enforce the presence of the <att>spanTo</att> attribute</desc>
<constraint>
<sch:assert test="@spanTo">The spanTo= attribute of <sch:name/>
is required.</sch:assert>
</constraint>
</constraintSpec>
<constraintSpec ident="demo-c2" scheme="isoschematron">
<desc>Implement an accessibility rule which says that pictures should
have textual explanations</desc>
<constraint>
<sch:report test="not(tei:figDesc or tei:head)"> You should
provide information in a figure from which
we can construct an alt attribute in HTML </sch:report>
</constraint>
</constraintSpec>
<desc>Implement an accessibility rule which says that pictures should
have textual explanations</desc>
<constraint>
<sch:report test="not(tei:figDesc or tei:head)"> You should
provide information in a figure from which
we can construct an alt attribute in HTML </sch:report>
</constraint>
</constraintSpec>
<constraintSpec ident="local" scheme="private">
<constraint>
(output = leq(title,author) "title and author cannot be the same")
</constraint>
</constraintSpec>
<constraint>
(output = leq(title,author) "title and author cannot be the same")
</constraint>
</constraintSpec>