<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:include schemaLocation="types.xsd"/> <xsd:element name="model"> <xsd:complexType> <xsd:choice minOccurs="1" maxOccurs="unbounded"> <xsd:element name="bank" type="pcilib_bank_t" minOccurs="0" maxOccurs="unbounded" /> <xsd:element name="transform" type="pcilib_transform_view_t" minOccurs="0" maxOccurs="unbounded" /> <xsd:element name="enum" type="pcilib_enum_view_t" minOccurs="0" maxOccurs="unbounded"> <xsd:key name="pcilib_value_name_key"> <xsd:selector xpath="name" /> <xsd:field xpath="@value" /> </xsd:key> </xsd:element> <xsd:element name="unit" type="pcilib_unit_t" minOccurs="0" maxOccurs="unbounded"> <xsd:key name="pcilib_unit_transform_key"> <xsd:selector xpath="transform" /> <xsd:field xpath="@unit" /> </xsd:key> </xsd:element> </xsd:choice> </xsd:complexType> <xsd:key name="pcilib_bank_key"> <xsd:selector xpath="bank" /> <xsd:field xpath="@name" /> </xsd:key> <!-- Currently, we define all registers, banks, views, and units as xsd:ID which prevents them from sharing name anyway. Currently it seems fine, but later it could turn out too be to strict. Then, we get problem also here as transform[@name] is ID of view, not register. But how can we restrict transform field to @register only? --> <xsd:key name="pcilib_register_key"> <xsd:selector xpath="bank/register|bank/register/field|transform" /> <xsd:field xpath="@name|@register" /> </xsd:key> <xsd:key name="pcilib_view_key"> <xsd:selector xpath="transform|enum" /> <xsd:field xpath="@name|@path" /> </xsd:key> <xsd:key name="pcilib_unit_key"> <xsd:selector xpath="unit" /> <xsd:field xpath="@name" /> </xsd:key> <xsd:keyref name="pcilib_register_view_ref" refer="pcilib_view_key"> <xsd:selector xpath="bank/register/view|bank/register/field/view" /> <xsd:field xpath="@view" /> </xsd:keyref> <!-- Actually, it is no problem to reference non-existing unit just for informative purposes <xsd:keyref name="pcilib_unit_ref" refer="pcilib_unit_key"> <xsd:selector xpath="transform|enum" /> <xsd:field xpath="@unit" /> </xsd:keyref> --> </xsd:element> </xsd:schema>