xs:group(definition) — Global elements group declaration that can be referenced within the same schema by other schemas.
by Eric van der Vlist
XML Schema
- A Note Regarding Supplemental Files
- Preface
- 1. Schema Uses and Development
- 2. Our First Schema
- 3. Giving Some Depth to Our First Schema
- 4. Using Predefined Simple Datatypes
- 5. Creating Simple Datatypes
- Derivation By Restriction
- Derivation By List
- Derivation By Union
- Some Oddities of Simple Types
- Back to Our Library
- 6. Using Regular Expressions to Specify Simple Datatypes
- 7. Creating Complex Datatypes
- 8. Creating Building Blocks
- 9. Defining Uniqueness, Keys, and Key References
- 10. Controlling Namespaces
- Namespaces Present Two Challenges to Schema Languages
- Namespace Declarations
- To Qualify Or Not to Qualify?
- Disruptive Attributes
- Namespaces and XPath Expressions
- Referencing Other Namespaces
- Schemas for XML, XML Base and XLink
- Namespace Behavior of Imported Components
- Importing Schemas with No Namespaces
- Chameleon Design
- Allowing Any Elements or Attributes from a Particular Namespace
- 11. Referencing Schemas and Schema Datatypes in XML Documents
- 12. Creating More Building Blocks Using Object-Oriented Features
- 13. Creating Extensible Schemas
- 14. Documenting Schemas
- 15. Elements Reference Guide
- xs:all(outside a group) — Compositor describing an unordered group of elements.
- xs:all(within a group) — Compositor describing an unordered group of elements. The number of occurrences cannot be defined when xs:all is used within a group.
- xs:annotation — Informative data for human or electronic agents.
- xs:any — Wildcard to replace any element.
- xs:anyAttribute — Wildcard to replace any attribute.
- xs:appinfo — Information for applications.
- xs:attribute(global definition) — Global attribute definition that can be referenced within the same schema by other schemas.
- xs:attribute(reference or local definition) — Reference to a global attribute definition or local definition (local definitions cannot be referenced).
- xs:attributeGroup(global definition) — Global attributes group declaration that can be referenced within the same schema by other schemas.
- xs:attributeGroup(reference) — Reference to a global attributes group declaration.
- xs:choice(outside a group) — Compositor to define group of mutually exclusive elements or compositors.
- xs:choice(within a group) — Compositor to define group of mutually exclusive elements or compositors. The number of occurrences cannot be defined when xs:choice is used within a group.
- xs:complexContent — Definition of a complex content by derivation of a complex type.
- xs:complexType(global definition) — Global definition of a complex type that can be referenced within the same schema by other schemas.
- xs:complexType(local definition) — Complex type local definition (local definitions cannot be referenced).
- xs:documentation — Human-targeted documentation.
- xs:element(global definition) — Global element definition that can be referenced within the same schema by other schemas.
- xs:element(within xs:all) — Reference to a global element declaration or local definition (local definitions cannot be referenced). The number of occurrences can only be zero or one when xs:element is
- xs:element(reference or local definition) — Reference to a global element declaration or local definition (local definitions cannot be referenced).
- xs:enumeration — Facet to restrict a datatype to a finite set of values.
- xs:extension(simple content) — Extension of a simple content model.
- xs:extension(complex content) — Extension of a complex content model.
- xs:field — Definition of the field to use for a uniqueness constraint.
- xs:fractionDigits — Facet to define the number of fractional digits of a numerical datatype.
- xs:group(definition) — Global elements group declaration that can be referenced within the same schema by other schemas.
- xs:group(reference) — Reference to a global elements group declaration or local definition (local definitions cannot be referenced).
- xs:import — Import of a W3C XML Schema for another namespace.
- xs:include — Inclusion of a W3C XML Schema for the same target namespace.
- xs:key — Definition of a key.
- xs:keyref — Definition of a key reference.
- xs:length — Facet to define the length of a value.
- xs:list — Derivation by list.
- xs:maxExclusive — Facet to define a maximum (exclusive) value.
- xs:maxInclusive — Facet to define a maximum (inclusive) value.
- xs:maxLength — Facet to define a maximum length.
- xs:minExclusive — Facet to define a minimum (exclusive) value.
- xs:minInclusive — Facet to define a minimum (inclusive) value.
- xs:minLength — Facet to define a minimum length.
- xs:notation — Declaration of a notation.
- xs:pattern — Facet to define a regular expression pattern constraint.
- xs:redefine — Inclusion of a W3C XML Schema for the same namespace with possible override.
- xs:restriction(simple type) — Derivation of a simple datatype by restriction.
- xs:restriction(simple content) — Derivation of a simple content model by restriction.
- xs:restriction(complex content) — Derivation of a complex content model by restriction.
- xs:schema — Document element of a W3C XML Schema.
- xs:selector — Definition of the the path selecting an element for a uniqueness constraint.
- xs:sequence(outside a group) — Compositor to define an ordered group of elements.
- xs:sequence(within a group) — Compositor to define an ordered group of elements. The number of occurrences cannot be defined when xs:all is used within a group.
- xs:simpleContent — Simple content model declaration.
- xs:simpleType(global definition) — Global simple type declaration that can be referenced within the same schema by other schemas.
- xs:simpleType(local definition) — Local simple type definition (local definitions cannot be referenced).
- xs:totalDigits — Facet to define the total number of digits of a numeric datatype.
- xs:union — Derivation of simple datatypes by union.
- xs:unique — Definition of a uniqueness constraint.
- xs:whiteSpace — Facet to define whitespace behavior.
- 16. Datatype Reference Guide
- xs:anyURI — URI (Uniform Resource Identifier).
- xs:base64Binary — Binary content coded as “base64”.
- xs:boolean — Boolean (true or false).
- xs:byte — Signed value of 8 bits.
- xs:date — Gregorian calendar date.
- xs:dateTime — Instant of time (Gregorian calendar).
- xs:decimal — Decimal numbers.
- xs:double — IEEE 64 bit floating point.
- xs:duration — Time durations.
- xs:ENTITIES — Whitespace separated list of unparsed entity references.
- xs:ENTITY — Reference to an unparsed entity.
- xs:float — IEEE 32 bit floating point.
- xs:gDay — Recurring period of time: monthly day.
- xs:gMonth — Recurring period of time: yearly month.
- xs:gMonthDay — Recurring period of time: yearly day.
- xs:gYear — Period of one year.
- xs:gYearMonth — Period of one month.
- xs:hexBinary — Binary contents coded in hexadecimal.
- xs:ID — Definition of unique identifiers.
- xs:IDREF — Definition of references to unique identifiers.
- xs:IDREFS — Definition of lists of references to unique identifiers.
- xs:int — 32 bit signed integers.
- xs:integer — Signed integers of arbitrary length.
- xs:language — RFC 1766 language codes.
- xs:long — 64 bit signed integers.
- xs:Name — XML 1.O names.
- xs:NCName — Unqualified names.
- xs:negativeInteger — Strictly negative integers of arbitrary length.
- xs:NMTOKEN — XML 1.0 name token (NMTOKEN).
- xs:NMTOKENS — List of XML 1.0 name token (NMTOKEN).
- xs:nonNegativeInteger — Integers of arbitrary length positive or equal to zero.
- xs:nonPositiveInteger — Integers of arbitrary length negative or equal to zero.
- xs:normalizedString — Whitespace-replaced strings.
- xs:NOTATION — Emulation of the XML 1.0 feature.
- xs:positiveInteger — Strictly positive integers of arbitrary length.
- xs:QName — Namespaces in XML qualified names.
- xs:short — 32 bit signed integers.
- xs:string — Any string.
- xs:time — Point in time recurring each day.
- xs:token — Whitespace-replaced and collapsed strings.
- xs:unsignedByte — Unsigned value of 8 bits.
- xs:unsignedInt — Unsigned integer of 32 bits.
- xs:unsignedLong — Unsigned integer of 64 bits.
- xs:unsignedShort — Unsigned integer of 16 bits.
- A. XML Schema Languages
- B. Work in Progress
- Glossary
- Index
- About the Author
- Colophon
- Copyright
Name
xs:group(definition) — Global elements group declaration that can be referenced within the same schema by other schemas.
Synopsis
<xs:group
name = xs:NCName
>
Content: (xs:annotation?, (xs:all | xs:choice | xs:sequence))
</xs:group>
May be included in: xs:redefine, xs:schema
Description
Groups of elements can be globally defined and used as containers, which can be referenced elsewhere in this schema or in other schemas. These containers, which are almost free of semantics, are very flexible and may be used as building blocks for the definition of local or global complex types.
Being global components, they can also be used to encapsulate element
definitions that cannot be made global, such as unqualified elements
in a schema with target namespaces, multiple elements with the same
name in a schema, elements that should not be used as document
elements, or elements that should be redefined through
xs:redefine in other schemas.
Element groups can be redefined through
xs:redefine; the redefinition can be either a
restriction (similar to a complex type derivation by restriction) or
an extension. (This is more flexible than a complex type extension
since the location where the base group is included in the new group
can be chosen, while the new elements are always located after the
base type during a derivation by extension.)
Any of the three compositors (xs:all,
xs:sequence, or xs:choice) may
be used to create an element group.
Restrictions
When a group is created using a xs:all compositor,
this group inherits all the restrictions of
xs:all. In other words, including a
xs:all compositor in a group is not a workaround
to avoid the fundamental restrictions of xs:all!
Group definition cannot be recursive.
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