| ========================== | |
| XSD element research notes | |
| ========================== | |
| :Authors: Jurko Gospodnetić | |
| :Date: 2014-06-29 | |
| Global/local elements | |
| --------------------- | |
| XSD schema elements are separated into two disjunct groups: | |
| _`global` | |
| top-level elements and non-top-level reference elements (such references may | |
| only reference top-level elements, whether from the same or another schema) | |
| _`local` | |
| non-top-level non-reference elements | |
| _`Qualified`/_`unqualified` elements | |
| ------------------------------------ | |
| An XSD element is considered qualified if and only if one of the following | |
| holds: | |
| * it is `global`_ | |
| * its ``form`` attribute is set to ``qualified`` | |
| * its ``form`` attribute is unset and its schema's ``elementFormDefault`` | |
| attribute is set to ``qualified`` | |
| **suds implementation note:** The only allowed ``form`` & ``elementFormDefault`` | |
| attribute values are ``qualified`` & ``unqualified`` but ``suds`` interprets any | |
| value other than ``qualified`` as ``unqualified``. | |
| Element's _`target namespace` | |
| ----------------------------- | |
| An XSD element may have a `target namespace`_ assigned. | |
| If an XSD element has a `target namespace`_ assigned then an XML element | |
| corresponding to this XSD element must belong to that namespace. | |
| If an XSD element does not have a `target namespace`_ assigned then an XML | |
| element corresponding to this XSD element must not belong to any namespace. | |
| Whether an XSD element has a `target namespace`_ assigned depends on whether it | |
| is `qualified`_ or not, whether it is a reference and on its or its referenced | |
| element schema's ``targetNamespace`` attribute: | |
| * an `unqualified`_ element never has a `target namespace`_ assigned | |
| * a non-reference `qualified`_ element collects its `target namespace`_ from its | |
| schema's non-empty ``targetNamespace`` attribute or has no `target namespace`_ | |
| if its schema does not have a non-empty ``targetNamespace`` attribute value | |
| specified | |
| * a reference element (such elements are always `qualified`_) collects its | |
| `target namespace`_ in the same way but used its referenced element schema | |
| instead of its own | |