Get valid values for an element from its schema

[GU]

How can one get a list of enumeration values for a given element in an
XML schema? I have been looking at the Schema Object Model, but I'm
making very little headway. Can anyone give me a nudge in the right
direction?

Specifically, I am using Actions Pane to assist in creating a WordML
document. For elements with enumerated values, I want to provide the
user with the list of valid values from the schema. For example, if I
have an element defined like this:

<xs:element name="distribtype">
<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value="A"/>
<xs:enumeration value="B"/>
<xs:enumeration value="C"/>
<xs:enumeration value="D"/>
</xs:restriction>
</xs:simpleType>
</xs:element>

I want to show the user a ComboBox containing only those values.
Warning, confused rambling ahead:

I think I might be able to figure out how to use XmlSchema.SchemaTypes
to get part of the way, but only if the schema uses named types (which
it doesn't). It looks like I may have to dig through the Items
collection of the XmlSchema, although I haven't found any way to look
for a specific element yet. Even then, I'm still not sure how to dig
all the way down to the facets and find out what the possible values
are.

Thanks,

Jon

[Stan Kitsis [MSFT]]

Hi Jon,

If you want to get a list of expected elements (for example, in a sequence
or a choice), you can use XmlSchemaValidator.GetExpectedParticles method
(http://msdn2.microsoft.com/en-us/lib...particles.aspx)

If you want to get enumeration values for a given element/attribute, you can
use XmlSchemaEnumerationFacet class
(http://msdn2.microsoft.com/en-us/lib...ionfacet.aspx).

The example below shows how to use XmlSchemaEnumerationFacet to retrieve
enumeration values. "st" here is the (simple) type of your
element/attribute.

if (st.Content is XmlSchemaSimpleTypeRestriction)

{

XmlSchemaSimpleTypeRestriction xsstr = st.Content as
XmlSchemaSimpleTypeRestriction;

foreach (XmlSchemaFacet xsf in xsstr.Facets)

{

if (xsf is XmlSchemaEnumerationFacet)

{

// handle xsf.Value

}

}

}
--
Stan Kitsis
Program Manager, XML Technologies
Microsoft Corporation

This posting is provided "AS IS" with no warranties, and confers no rights.
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"GU" <go*********@mail.com> wrote in message
news:11**********************@j33g2000cwa.googlegr oups.com...

How can one get a list of enumeration values for a given element in an
XML schema? I have been looking at the Schema Object Model, but I'm
making very little headway. Can anyone give me a nudge in the right
direction?

Specifically, I am using Actions Pane to assist in creating a WordML
document. For elements with enumerated values, I want to provide the
user with the list of valid values from the schema. For example, if I
have an element defined like this:

<xs:element name="distribtype">
<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value="A"/>
<xs:enumeration value="B"/>
<xs:enumeration value="C"/>
<xs:enumeration value="D"/>
</xs:restriction>
</xs:simpleType>
</xs:element>

I want to show the user a ComboBox containing only those values.
Warning, confused rambling ahead:

I think I might be able to figure out how to use XmlSchema.SchemaTypes
to get part of the way, but only if the schema uses named types (which
it doesn't). It looks like I may have to dig through the Items
collection of the XmlSchema, although I haven't found any way to look
for a specific element yet. Even then, I'm still not sure how to dig
all the way down to the facets and find out what the possible values
are.

Thanks,

Jon