Re: Why a DTD and not a XML-Schema ?

Le 18/12/03 =E0 19:09, Andreas Pokorny a =E9crit:
Andreas> Hi,
Andreas> I am currently working on a xbuild ide. The main alpha feature w=
ill be the
Andreas> creation of valid xbuild files.=20


Hi,


Andreas> Why libxml2?
Andreas> - supports a lot of encodings, but converts to utf8. That makes =
writing
Andreas>   of application code simpler.=20

ok.

Andreas> - faster than all the others...

any benchmarks you are refering too ?


Andreas> Don't be afraid, all suggestions corrections and ..  are welcome=
d!=20
Andreas>=20
Andreas> I do have questions too:
Andreas>  From my point of view, dtd's define  a fixed hierachy of tags w=
ith
Andreas> attribute names and sub tags. While schemas define a fixed hiera=
rchy
Andreas> too, but allow finer control over the format of the character da=
ta
Andreas> within tags an attributes. Is that true? I was not able to read =
the full

you mean tags and attributes ?
if yes,
XML-SCHEMA allows that
see below

Andreas> spec of xml schema yet.=20
Andreas> -> The serialization library needs the fixed hierachy!

XML-Schema still allows you to to define a fixed hierarchy.

Here is a piece of XML-Schema to define your Person XML tag where the nam=
e's length=20
is 32 chars max. and of course the age is a positive integer: =20

<xs:simpleType name=3D"nameType">
  <xs:restriction base=3D"xs:string">
    <xs:maxLength value=3D"32"/>
  </xs:restriction>
</xs:simpleType>

<xs:element name=3D"Person" type=3D"mt:PersonType"/>

<xs:complexType name=3D"PersonType" base=3D"xs:string">
	<xs:attribute name=3D"age" type=3D"xs:non-negative-integer" use=3D"requi=
red" />
	<xs:attribute name=3D"name" type=3D"nameType" use=3D"required"/>
</xs:complexType>



Maybe I should try to convert the DTD in a XML-Schema ?


See you
Pac