Re: [cgmo-webcgm] how to add Style Properties to XCF?

[Benoit Bezaire <benoit@itedo.com>]

I like Alt 1. In my opinion, it's easier to parse and also easier to
understand...

-- 
 Benoit   mailto:benoit@itedo.com

 
Wednesday, June 15, 2005, 8:32:23 PM, Lofton wrote:

LH> WebCGM TC,

LH> Feedback welcome, if you have a preference...

LH> I think we decided today to add Style Properties to XCF (correct?).  Please
LH> state your preferences about...   How should we add them?

LH> Alt.1: to each element in XCF, add 9 attributes with names as in the SP
LH> table of 5.7.5.
LH> Alt.2:  to each element in XCF, add 1 attribute which is a string of 2n
LH> wsp-separated simple string-valued items (names and  values).

LH> RECOMMENDATION:  Alt.1

LH> DISCUSSION:

LH> For reference, the method in 5.7.5 is setStyleProperty(name, value), where
LH> name and value are type WebCGMString.  Discussion and examples....

LH> Alt.2 would look like, for grobject (4.4) example:
LH> ==========
LH> content
LH> ----
LH> <grobject  apsid="myObj1"  styleProperties="stroke-weight  50% 
LH> stroke-color  #FF0000" ...>

LH> DTD
LH> -----
LH> <!ENTITY % grobjectEXT "" >
LH> <!ENTITY % grobjectAttEXT "" >
LH> <!ELEMENT grobject ( linkuri %grobjectEXT; )* >
LH> <!ATTLIST grobject
LH>                      apsid         ID           #REQUIRED
LH>                      screentip     CDATA        #IMPLIED
LH>                      region        CDATA        #IMPLIED
LH>                      viewcontext   CDATA        #IMPLIED
LH>                      visibility    ( on | off | inherit) #IMPLIED
LH>                      interactivity ( on | off | inherit) #IMPLIED
LH>                      styleProperties   CDATA        #IMPLIED
LH>                      %grobjectAttEXT;
 >>

LH> and would contain some verbiage about the structure of the string  [(name
LH> wsp value wsp)+].  Such verbiage could be centralized in 4.10, "Attribute
LH> encoding", and referenced from each XCF element's section.

LH> Alt.1 would look like:
LH> ==========
LH> content
LH> -----
LH> <grobject  apsid="myObj1"  stroke-weight="50%"  stroke-color="#FF0000" ...>

LH> DTD
LH> -----
LH> On every element of XCF, the single styleProperty line of Alt.2 would be
LH> replaced by 9 lines (if we keep text-font, 8 otherwise):

LH> <!ENTITY % grobjectEXT "" >
LH> <!ENTITY % grobjectAttEXT "" >
LH> <!ELEMENT grobject ( linkuri %grobjectEXT; )* >
LH> <!ATTLIST grobject
LH>                      apsid         ID           #REQUIRED
LH>                      screentip     CDATA        #IMPLIED
LH>                      region        CDATA        #IMPLIED
LH>                      viewcontext   CDATA        #IMPLIED
LH>                      visibility    ( on | off | inherit) #IMPLIED
LH>                      interactivity ( on | off | inherit) #IMPLIED
LH>                      background-color     CDATA        #IMPLIED
LH>                      character-height     CDATA        #IMPLIED
LH>                      fill-color     CDATA        #IMPLIED
LH>                      intensity     CDATA        #IMPLIED
LH>                      stroke-color     CDATA        #IMPLIED
LH>                      stroke-weight     CDATA        #IMPLIED
LH>                      text-color     CDATA        #IMPLIED
LH>                      text-font     CDATA        #IMPLIED
LH>                      raster-intensity     CDATA        #IMPLIED 
LH> %grobjectAttEXT;
 >>

LH> and would pretty much just point to the table in 5.7.5 for contents of CDATA.

LH> Alt.1 seems more natural from the usage perspective, though it is uglier
LH> from the DTD-definition perspective, having to add 9 lines to every element
LH> in the DTD.  (That could be mitigated somewhat -- the DTD of XCF could also
LH> define an entity and put it in place of the 9 lines.)

LH> Preferences?

LH> -Lofton.