Oxygen XML Forum

Hello to everyone. Thanks for reading this.

Im working with XML Schema to specify graphs. In the graph we have nodes, and each node can have several attribute (with a key and value), but I want to force the user to always add one attribute with a specific key and three posible values… ¿Is this possible in XML SCHEMA without defining a new type or element…


This is the XML SCHEMA for the attribute
<!-- Global Attributes -->
<xsd:attributeGroup name="global-atts">
<xsd:attribute name="id" type="string.type" />
<xsd:attribute name="name" type="string.type" />
<xsd:attribute name="label" type="string.type" />
</xsd:attributeGroup>

<!-- Value Attribute -->
<xsd:attributeGroup name="attribute-value">
<xsd:attribute name="value" type="string.type" />
</xsd:attributeGroup>

<!-- Type Attribute -->
<xsd:attributeGroup name="attribute-type">
<xsd:attribute name="type" type="object.type" />
</xsd:attributeGroup>

<!-- Att Element -->
<xsd:element name="att">
<xsd:complexType mixed="true">
<xsd:sequence>
<xsd:element ref="att" minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
<xsd:attributeGroup ref="global-atts" />
<xsd:attributeGroup ref="attribute-value" />
<xsd:attributeGroup ref="attribute-type" />
</xsd:complexType>
</xsd:element>

And this for the node…
<!-- Simple Node (Structural Node) -->
<xsd:complexType name="simpleNode">
<xsd:sequence>
<xsd:element ref="att" minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
<xsd:attributeGroup ref="global-atts" />
</xsd:complexType>

And i want all node to be like this…
<node ...>
<att name=”Status” value=””> THIS ALWAYS HAVE TO BE WITH THAT NAME.
<att…
<att…
</node>

Thanxs for all

Hi,

No, you cannot do that in XML Schema. There are a couple of options further, use XML Schema with embedded Schematron rules, use Relax NG or use Schematron. All these options are supported by oXygen.

Best Regards,
George