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<?xml version="1.0" standalone="yes"?>
<!-- The ontology node is the root node of a single ontology definition -->
<ontology name="book">
<!-- We start by declaring the structured classes. This implicitly defines
a context free grammar, which specifies the language of documents that
may be constructed using this ontology. Note that this grammar may be
influenced by other ontologies depending on this one. -->
<!-- Note that we specify neither attributes,
nor parent, nor transparency, meaning that we refer to the default
values. Also note that we need to specify explicitly, which classes
are allowed as root nodes. -->
<struct name="book" cardinality="{1}" isRoot="true">
<!-- implicitly:
<struct name="book" cardinality="{1}" isRoot="true"
transparent="false" isa="" attributesDescriptor="">
-->
<!-- Note that we assume that, if not specified, a
field is assumed to have no name, be of type TREE
and not optional. -->
<field>
<!-- implicitly:
<field name="" isSubtree="false" optional="false">
-->
<!-- Using such child references might be problematic if
multiple nodes are matched. This should probably
result in an exception.
Also note that we only reference the child classes.
We do _not_ declare them here. This might lead to
some difficulties in the parsing process as I
effectively use forward declarations here. So the
resolve() process may only be started _after_ all
delcarations are read. -->
<childRef ref="book.chapter"/>
<!-- The dot notation as path separator might be changed
but I think it to be intuitive. If we want a more
CSS like style we can use whitespaces here. -->
<childRef ref="book.paragraph"/>
</field>
</struct>
<struct name="chapter">
<!-- implicitly:
<struct name="chapter" isRoot="false" cardinality="{*}"
transparent="false" isa="" attributesDescriptor="">
-->
<field>
<!-- implicitly:
<field name="" isSubtree="false" optional="false">
-->
<childRef ref="book.section"/>
<childRef ref="book.paragraph"/>
</field>
</struct>
<struct name="section">
<!-- implicitly:
<struct name="section" isRoot="false" cardinality="{*}"
transparent="false" isa="" attributesDescriptor="">
-->
<field>
<!-- implicitly:
<field name="" isSubtree="false" optional="false">
-->
<childRef ref="book.subsection"/>
<childRef ref="book.paragraph"/>
</field>
</struct>
<struct name="subsection">
<!-- implicitly:
<struct name="subsection" isRoot="false" cardinality="{*}"
transparent="false" isa="" attributesDescriptor="">
-->
<field>
<!-- implicitly:
<field name="" isSubtree="false" optional="false">
-->
<childRef ref="book.paragraph"/>
</field>
</struct>
<struct name="paragraph" transparent="true">
<!-- implicitly:
<struct name="subsection" isRoot="false" cardinality="{*}"
transparent="true" isa="" attributesDescriptor="">
-->
<field>
<!-- implicitly:
<field name="" type="TREE" optional="false">
-->
<childRef ref="book.text"/>
</field>
</struct>
<struct name="text" transparent="true">
<!-- implicitly:
<struct name="text" isRoot="false" cardinality="{*}"
transparent="true" isa="" attributesDescriptor="">
-->
<!-- we might want to specify std.string here -->
<primitive type="string"/>
</struct>
</ontology>
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