Re: [mmox] Example of what could be a real XML LLSD

[[e-mail]]

Apologies if I missed the answer if it was in an earlier message...

The "XML way" message appears to be loosly typed. How could a parser create an object from that XML data and know the difference between an integer and a float, or a UUID and a string? 

--Tom



________________________________
From: Catherine Pfeffer <[e-mail]>
To: [e-mail]
Sent: Tuesday, February 24, 2009 5:24:40 PM
Subject: [mmox] Example of what could be a real XML LLSD

Hello,

Here is a real LLSD packet. Below I'll show how it could look like if we would abandon the 1:1 mapping to binary serialization.

If transposing 1:1 the binary encoding, the packet is 2688 bytes long. If doing it in a more xml-ish way, the packet is 1065 bytes long. That's 40 % of the length the current LLSD proposal generates. It's also more legible by humans, easier to validate and easier to parse. Those figures include 2 spaces of indentation at each tag level, and all the newline characters.

First the "transposition of binary serialization" way:

<llsd>
  <map>
    <key>AgentData</key>
    <map>
      <key>AgentId</key>
      <uuid>81466fc7-276f-455d-9b72-8316e9712535</uuid>
      <key>GroupId</key>
      <uuid/>
      <key>SessionId</key>
      <uuid>4bbb6fa9-e649-4507-a709-8831c237c4ee</uuid>
    </map>
    <key>ObjectData</key>
    <map>
      <key>BypassRaycast</key>
      <boolean>1</boolean>
      <key>EveryoneMask</key>
      <binary encoding="base64">AAAAAA==</binary>
      <key>Flags</key>
      <binary encoding="base64">AAAAAg==</binary>
      <key>GroupMask</key>
      <binary encoding="base64">AAAAAA==</binary>
      <key>Material</key>
      <integer>3</integer>
      <key>NextOwnerMask</key>
      <binary encoding="base64">AAjAAA==</binary>
      <key>PCode</key>
      <integer>9</integer>
      <key>Path</key>
      <map>
        <key>Begin</key>
        <integer>0</integer>
        <key>Curve</key>
        <integer>16</integer>
        <key>End</key>
        <integer>0</integer>
        <key>RadiusOffset</key>
        <integer>0</integer>
        <key>Revolutions</key>
        <integer>0</integer>
        <key>ScaleX</key>
        <integer>100</integer>
        <key>ScaleY</key>
        <integer>100</integer>
        <key>ShearX</key>
        <integer>0</integer>
        <key>ShearY</key>
        <integer>0</integer>
        <key>Skew</key>
        <integer>0</integer>
        <key>TaperX</key>
        <integer>0</integer>
        <key>TaperY</key>
        <integer>0</integer>
        <key>Twist</key>
        <integer>0</integer>
        <key>TwistBegin</key>
        <integer>0</integer>
      </map>
      <key>Profile</key>
      <map>
        <key>Begin</key>
        <integer>0</integer>
        <key>Curve</key>
        <integer>1</integer>
        <key>End</key>
        <integer>0</integer>
        <key>Hollow</key>
        <integer>0</integer>
      </map>
      <key>RayEnd</key>
      <array>
        <real>42.9329986572265625</real>
        <real>29.6600322723388671875</real>
        <real>31.399318695068359375</real>
      </array>
      <key>RayEndIsIntersection</key>
      <boolean>0</boolean>
      <key>RayStart</key>
      <array>
        <real>48.281482696533203125</real>
        <real>32.063152313232421875</real>
        <real>34.092010498046875</real>
      </array>
      <key>RayTargetId</key>
      <uuid/>
      <key>Rotation</key>
      <array>
        <real>0</real>
        <real>0</real>
        <real>0</real>
        <real>1</real>
      </array>
      <key>Scale</key>
      <array>
        <real>0.5</real>
        <real>0.5</real>
        <real>0.5</real>
      </array>
      <key>State</key>
      <integer>0</integer>
    </map>
  </map>
</llsd>

Now the "XML" way:

<llsd>
  <AgentData
      AgentId="81466fc7-276f-455d-9b72-8316e9712535"
      GroupId=""
      SessionId="4bbb6fa9-e649-4507-a709-8831c237c4ee" />
    <ObjectData
        BypassRaycast="1"
        EveryoneMask="0x00000000"
        Flags="0x00000002"
        GroupMask="0x00000000"
        Material="3"
        NextOwnerMask="0x0008C000"
        PCode="9">
      <Path
          Begin="0"
          Curve="16"
          End="0"
          RadiusOffset="0"
          Revolutions="0"
          ScaleX="100"
          ScaleY="100"
          ShearX="0"
          ShearY="0"
          Skew="0"
          TaperX="0"
          TaperY="0"
          Twist="0"
          TwistBegin="0" />
        <Profile
           Begin="0"
           Curve="1"
            End="0"
            Hollow="0" />
      <RayEnd
            x="42.9329986572265625"
            y="29.6600322723388671875"
            z="31.399318695068359375"
            IsIntersection="0" />
      <RayStart
            x="48.281482696533203125"
            y="32.063152313232421875"
            z="34.092010498046875" />
      <RayTargetId uuid="" />
      <Rotation x="0" y="0" z="0" s="1" />
      <Scale x="0.5" y="0.5" z="0.5" />
      <State bool="0" />
    </ObjectData>
</llsd>

Even better results could be achieved by using default values for some attributes.

-- 
Cathy