On 01/17/2019 02:11 PM, Albert wrote:
When I use the attached xml file in xmlmind I get the warning:
[2] <1> bad value for attribute "id" from namespace
"http://www.w3.org/XML/1998/namespace";
[3] <2> bad value for attribute "linkend"
The problem looks like to be the ':' in the xml:id. I searched the
internet and also some things on
stackoverflow(https://stackoverflow.com/questions/1077084/what-characters-are-allowed-in-dom-ids),
but from this I didn't see any restriction in using a ':' in an xml:id.
Did I miss something or it this an omission in xmlmind?
In a nutshell, XMLmind XML Editor is correct in implementing what is
specified in the DocBook v5.0 schema. Excerpts from "docbook.rng":
---
...
<grammar ... datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes";
...
<define name="db.xml.id.attribute">
<attribute name="xml:id">
<a:documentation>Identifies the unique ID value of the
element</a:documentation>
<data type="ID"/>
</attribute>
</define>
...
<define name="db.linkend.attribute">
<attribute name="linkend">
<a:documentation>Points to an internal link target by identifying
the value of its xml:id attribute</a:documentation>
<data type="IDREF"/>
</attribute>
</define>
...
---
So what are <data type="ID"/> and <data type="IDREF"/>?
* <data type="ID"/> is defined in https://www.w3.org/TR/xmlschema-2/#ID
---
ID represents the ID attribute type from [XML 1.0 (Second Edition)]. The
·value space· of ID is the set of all strings that ·match· the NCName
production in [Namespaces in XML]. The ·lexical space· of ID is the set
of all strings that ·match· the NCName production in [Namespaces in
XML]. The ·base type· of ID is NCName.
---
* <data type="IDREF"/> is defined in
https://www.w3.org/TR/xmlschema-2/#IDREF
---
IDREF represents the IDREF attribute type from [XML 1.0 (Second
Edition)]. The ·value space· of IDREF is the set of all strings that
·match· the NCName production in [Namespaces in XML]. The ·lexical
space· of IDREF is the set of strings that ·match· the NCName production
in [Namespaces in XML]. The ·base type· of IDREF is NCName. ---
"NCName" (https://www.w3.org/TR/xml-names/#NT-NCName), not "Name"
(https://www.w3.org/TR/REC-xml/#NT-Name). Hence, semi-column not allowed.
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