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Lines 53-59
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<para>Inevitably, this was not enough. Once you have text in a |
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<para>Inevitably, this was not enough. Once you have text in a |
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machine-usable format, you expect machines to be able to use it and |
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machine-usable format, you expect machines to be able to use it and |
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manipulate it intelligently. You would like to indicate that certain |
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manipulate it intelligently. You would like to indicate that certain |
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phrases should be emphasised, or added to a glossary, or be hyperlinks. |
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phrases should be emphasized, or added to a glossary, or be hyperlinks. |
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You might want filenames to be shown in a <quote>typewriter</quote> style |
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You might want filenames to be shown in a <quote>typewriter</quote> style |
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font for viewing on screen, but as <quote>italics</quote> when printed, |
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font for viewing on screen, but as <quote>italics</quote> when printed, |
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or any of a myriad of other options for presentation.</para> |
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or any of a myriad of other options for presentation.</para> |
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Lines 90-96
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<para>The extra information stored in the markup <emphasis>adds |
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<para>The extra information stored in the markup <emphasis>adds |
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value</emphasis> to the document. Adding the markup to the document |
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value</emphasis> to the document. Adding the markup to the document |
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must typically be done by a person—after all, if computers could |
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must typically be done by a person—after all, if computers could |
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recognise the text sufficiently well to add the markup then there would |
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recognize the text sufficiently well to add the markup then there would |
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be no need to add it in the first place. This <emphasis>increases the |
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be no need to add it in the first place. This <emphasis>increases the |
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cost</emphasis> (i.e., the effort required) to create the |
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cost</emphasis> (i.e., the effort required) to create the |
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document.</para> |
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document.</para> |
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<para>A tag is used to identify where a particular element starts, and |
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<para>A tag is used to identify where a particular element starts, and |
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where the element ends. <emphasis>The tag is not part of the element |
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where the element ends. <emphasis>The tag is not part of the element |
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itself</emphasis>. Because each DTD was normally written to mark up |
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itself</emphasis>. Because each DTD was normally written to mark up |
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specific types of information, each one will recognise different |
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specific types of information, each one will recognize different |
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elements, and will therefore have different names for the tags.</para> |
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elements, and will therefore have different names for the tags.</para> |