I want to define a tag in my schema for anything. It should be able to contain any combination of tags and text.
So far I've found
<xs:complexType name="customType" mixed="true">
<xs:sequence>
<xs:any processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:anyAttribute processContents="lax"/>
</xs:complexType>
I'm wondering if there is a shorter way. Something like
<xs:element name="custom" type="anything"/>
Thanks for your time.
Yes. In fact you can just write
<xsd:element name="XYZ"/>
Check here for info: http://www.w3.org/TR/xmlschema-0/#anyType
Related
I have an Xml file like this:
<Configuration xmlns="http://schemas.benefittech.com/evolution/site">
<SiteSettings>
<ProfileGroup>TBOLoanPmtElection</ProfileGroup>
<AWSGroup>TBOLoanPmtElection_Admin</AWSGroup>
</SiteSettings>
</Configuration>
And I have an XSD file like this:
<?xml version="1.0" encoding="us-ascii" ?>
<xs:schema elementFormDefault="qualified" attributeFormDefault="unqualified" version="5.0"
xmlns="http://schemas.benefittech.com/evolution/site" targetNamespace="http://schemas.benefittech.com/evolution/site"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:vs="http://schemas.benefittech.com/Visual-Studio-Intellisense" vs:friendlyname="Evolution Site Configuration">
<xs:element name="Configuration">
<xs:complexType>
<xs:all>
<xs:element name="SiteSettings" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:all>
<xs:element name="AWSGroup" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="ProfileGroup" type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="LogActivityGroup" type="xs:string" minOccurs="0" maxOccurs="1"/>
</xs:all>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
</xs:schema>
I want to enable my Xml to look something like the following to allow for 'environment overrides' (the E attribute on the env:* element):
<Configuration xmlns="http://schemas.benefittech.com/evolution/site" xmlns:env="http://schemas.benefittech.com/evolution/siteenvironment">
<SiteSettings>
<ProfileGroup>TBOLoanPmtElection</ProfileGroup>
<AWSGroup>TBOLoanPmtElection_Admin</AWSGroup>
<env:AWSGroup E="SecondEnvironment">TBOLoanPmtElection2_Admin</env:AWSGroup>
</SiteSettings>
</Configuration>
Is there a way to modify the XSD so that given EVERY element in my configuration, I want to optionally have a env:* version of it. Do I have to make a new schema file like below that is basically a duplicate of original except for the target namespace?
<?xml version="1.0" encoding="us-ascii" ?>
<xs:schema elementFormDefault="qualified" attributeFormDefault="unqualified" version="5.0"
xmlns="http://schemas.benefittech.com/evolution/siteenvironment" targetNamespace="http://schemas.benefittech.com/evolution/siteenvironment"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:vs="http://schemas.benefittech.com/Visual-Studio-Intellisense" vs:friendlyname="Evolution Site Configuration">
<xs:element name="Configuration">
<xs:complexType>
<xs:all>
<xs:element name="SiteSettings" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:all>
<xs:element name="AWSGroup" type="xs:string" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:attribute name="E" use="required" type="xs:string"/>
</xs:complexType>
</xs:element>
<xs:element name="ProfileGroup" type="xs:string" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:attribute name="E" use="required" type="xs:string"/>
</xs:complexType>
</xs:element>
<xs:element name="LogActivityGroup" type="xs:string" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:attribute name="E" use="required" type="xs:string"/>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
</xs:schema>
Is there a way to modify the XSD so that given EVERY element in my configuration, I want to optionally have a env:* version of it.
No, there is no elegant way to add, after each element, an optional element having the same name but a different namespace. You would need to add each such env:* element individually.
Do I have to make a new schema file like below that is basically a duplicate of original except for the target namespace?
Yes, but only if you stick to this plan of using a different namespace for the 'extension' elements. In your reply to my comment you said
I thought I'd need separate namespaces. I didn't want to change code everywhere that selects elements. For example, SiteConfig.Elements( "SiteSettings" ).Elements( "AWSGroup" ).FirstOrDefault(); Would continue to work without picking up the env:* elements. Then during the publish process, I would swap out the env:* properties everywhere and code would just work. What's your suggestion?
I've hardly written a line of C#, but according to https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.firstordefault?view=netcore-3.1 the FirstOrDefault() method returns the first element in the sequence or a default. So I think there is a much simpler approach that will not break the existing code...
On each element that needs to have option extension element(s):
Set maxOccurs="unbounded" (or "2", if you only want to allow one extension element)
Add the attribute "E" and make it optional (so that existing documents which omit it on the first occurrence are still valid).
The name "E" for the attribute is not ideal - I would pick something more descriptive if possible.
I have the following XSD structure:
<xs:schema xmlns:ns="http://abc/">
...
<xs:element name="abc">
<xs:complexType>
<xs:sequence>
<xs:element ref="map"/>
</xs:sequence>
</xs:complexType>
</xs:element>
...
<xs:element name="map">
<xs:complexType>
<xs:sequence>
<xs:element name="entry" type="ns:MapEntryType" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:unique name="entry">
<xs:selector xpath="entry"/>
<xs:field xpath="key"/>
</xs:unique>
</xs:element>
<xs:complexType name="MapEntryType">
<xs:sequence>
<xs:element name="key" type="xs:string"/>
<xs:element name="value" type="xs:anyType"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
This is doing its job.
The map element now has to be called something different based on whichever is the wrapper, so the name is sometimes map, sometimes properties, sometimes options, etc.
Therefore I want to genericize the map element.
I tried doing the following:
Making map a xs:complexType and changing ref to type.
This resulted in xs:unique not being accepted and failed
Making map a xs:complexType, changing ref to type and moving the xs:unique constraint to the element definitions.
This worked but resulted in the XSD having a lot of xs:unique present in the document.
Isn't there a way to simply tell that I want a specific structure and it containing unique elements without having to repeat the unique constraint everywhere?
As Petru Gardea said in his answer
Both XSD 1.0 and 1.1 place the identity constraints under an element
So you have to add xs:unique to every element, but if you are using XSD 1.1 you can define only once a complete xs:unique and then in the rest of the elements use xs:unique ref="name". This is not valid for you as you are using XSD 1.0, but I let it here for future XSD 1.1 users that find this good question.
Example (namespaces removed for clarity):
<xs:element name="map">
<xs:complexType>
<xs:sequence>
<xs:element name="entry" type="MapEntryType" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<!-- Only completely defined once -->
<xs:unique name="uniqueEntry">
<xs:selector xpath="entry"/>
<xs:field xpath="key"/>
</xs:unique>
</xs:element>
<xs:element name="hashMap">
<xs:complexType>
<xs:sequence>
<xs:element name="entry" type="MapEntryType" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<!-- Referenced here and every other time -->
<xs:unique ref="uniqueEntry"/>
</xs:element>
Short answer, it is not possible. Both XSD 1.0 and 1.1 place the identity constraints under an element; a constraint cannot be globally defined, therefore there is no "reuse" per se, other than that of the enclosing element. Given your scenario (different element names for different needs) it is not possible to reuse.
How should I reference another complexType in xml, as element or as attribute over my own defined Key? What is the correct approach to model the following self-reference? Is the first approach even possible, or does it lead to infinite self-referencing?
<xs:complexType name="Category">
<xs:sequence>
<xs:element name="ParentCategory" type="Category" minOccurs="1" maxOccurs="1"></xs:element>
<xs:element name="ChildCategory" type="Category" minOccurs="0" maxOccurs="unbounded"></xs:element>
</xs:sequence>
<xs:attribute name="CategoryName" type="xs:string"></xs:attribute>
</xs:complexType>
or
<xs:complexType name="Category">
<xs:sequence>
<xs:element name="ChildCategory" type="Category" minOccurs="0" maxOccurs="unbounded"></xs:element>
</xs:sequence>
<xs:attribute name="CategoryName" type="xs:string"></xs:attribute>
<xs:attribute name="ParentCategory" type="xs:string"></xs:attribute>
</xs:complexType>
I'm a bit confused - since I want to be object oriented, but am not sure how this would look like in XML. Wouldn't the reference of ParentCategory as a Category-type require me to again write a Category-type in XML that itself has a ParentCategory child-element, etc... leading to infinite type-referencing.
There's no issue referencing an element of the same type as part of the type definition, so your first example is fine from that point of view. Trying to reference the parent is a bit odd though, you shouldn't really need to do this... XML is hierarchical after all.
<xs:complexType name="Category">
<xs:sequence>
<xs:element maxOccurs="unbounded" minOccurs="0" name="ChildCategory" type="Category"/>
</xs:sequence>
<xs:attribute name="CategoryName" type="xs:string"/>
</xs:complexType>
The Category type references itself recursively, allowing for 0 or more ChildCategory elements. This should do what you need (there's nothing wrong with recursive type referencing in the XML Schema).
If you need to refer to the parent Category in your document, it's easy enough to chain to the parent node in any DOM implementation or with XPath.
I've a base class, marked as abstract:
<!-- TYPE: BASE CLASS -->
<xs:complexType name="BaseClass" abstract="true">
<xs:sequence>
<xs:element name="name" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="implementation" type="BaseClass" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
Now the class that inherits BaseClass and overrides 'implementation' with null:
<xs:complexType name="MyClass">
<xs:complexContent>
<xs:extension base="BaseClass"/>
</xs:complexContent>
</xs:complexType>
I've tried this but is invalid:
<xs:complexType name="MyClass">
<xs:complexContent>
<xs:extension base="BaseClass">
<xs:sequence>
<xs:element name="implementation" fixed="xs:nil"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
Is there a way to do this?
Marking something as abstract in XSD schema basically means that it cannot appear in an instance document. It should be used with the substitutionGroup attribute.
For example
<xs:element name="replaceme" abstract="true" />
<xs:element name="replacement1" substitutionGroup="replaceme" />
<xs:element name="replacement2" substitutionGroup="replaceme" />
This means that in an instance document you would be forced to use either a "replacement1" or a "replacement2" element, ie the xsd is forcing you to substitute the "replaceme" element with one of the replacements from the substitution group.
So to achieve what you want you need to create a substitution group consisting of the types you want to use instead of your base type. I am not sure this is possible with complex types but give it a go.
Given this XML Schema snippet:
<xs:element name="data">
<xs:complexType>
<xs:sequence>
<xs:element name="param" type="param" minOccurs="0" maxOccurs="unbounded" />
<xs:element name="format" type="format" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
<xs:attribute name="name" type="xs:string" />
</xs:complexType>
</xs:element>
The intended result is valid <data> elements may contain 0 or more <param> elements followed by 0 or more <format> elements. Have I added the minOccurs/maxOccurs atttributes correctly, or should they be applied to the containing <xs:sequence>?
Correct or not, what would be the result of going one way or the other?
You have done it right and you can not add min/max occurs to sequence element. Using and XML editor that supports XML Schema might help you to validate your assumptions when you are in doubt. Here is a good free ware called XMLFox