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<!-- Regina data file format documentation.
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See ../regina.sgml for further details. -->
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<refentry id="data-realbdry-filter">
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<refentrytitle>realbdry (filter)</refentrytitle>
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<manvolnum>5reg</manvolnum>
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<refname>realbdry (filter)</refname>
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<refpurpose>A constraint on real boundary</refpurpose>
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<informaltable frame="all">
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<colspec colname="c1"/>
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<colspec colname="c2"/>
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<row><entry namest="c1" nameend="c2">
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<emphasis role="bold">Content Model</emphasis>
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<row><entry namest="c1" nameend="c2">
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realbdry ::=</synopsis>
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<row><entry namest="c1" nameend="c2">
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<emphasis role="bold">Attributes</emphasis>
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<entry><emphasis role="bold">Name</emphasis></entry>
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<entry><emphasis role="bold">Type</emphasis></entry>
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<entry><sgmltag>value</sgmltag></entry>
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<entry><type>CDATA</type> (required)</entry>
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<title>Description</title>
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A &xml-realbdry-filter; element represents a constraint on the
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boundary of a normal surface. A surface with real boundary
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is one that meets one or more boundary faces of the underlying
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<title>Parents</title>
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The following elements contain <sgmltag>realbdry</sgmltag> (in the
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context of a constraint on surface properties):
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<simplelist type="inline">
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<member>&xml-filter-properties;</member>
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<title>Children</title>
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Element <sgmltag>realbdry</sgmltag> (in the context of a
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constraint on surface properties) has no children.
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<title>Attributes</title>
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<term><sgmltag>value</sgmltag></term>
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Contains the specific constraint upon the boundary of a surface.
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The following values are allowed.
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<literal>TF</literal> signifies that the surface may either
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have real boundary or may not, i.e., no constraint is imposed.
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<literal>T-</literal> signifies that the surface must have real
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<literal>-F</literal> signifies that the surface must not have
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<literal>--</literal> signifies that the surface must neither
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have real boundary nor not have real boundary, i.e., no surfaces