مخطط الجلوس قرب الباب.

It can be understood either way, depending on context.

• As a complete sentence, it means something like The seating plan is near the door.
• As a noun phrase, it could mean the seating plan near the door.

If this appears by itself, many learners will naturally read it as a nominal sentence in the present tense.

In Arabic, present-tense sentences often do not use a word for "is / am / are".

So:

• مخطط الجلوس = the seating plan
• قرب الباب = near the door

Put together:

• مخطط الجلوس قرب الباب = The seating plan is near the door

This is very normal in Arabic. The verb to be is usually omitted in the present tense.

This is an iḍāfa construction (an annexation / noun-noun construction).

Structure:

• مخطط = plan / chart / layout
• الجلوس = the seating / sitting

Together:

• مخطط الجلوس = the seating plan / the seating chart

In an iḍāfa:

• the first noun is the main thing
• the second noun specifies it

So this works like English X of Y or sometimes like an English compound noun.

Because in an iḍāfa, the first noun normally does not take الـ.

So:

• مخطط الجلوس can still mean the seating plan
• even though مخطط itself does not have الـ

The whole phrase becomes definite because the second part, الجلوس, is definite.

So this is normal:

• مخطط الجلوس = the seating plan

Not normal in this structure:

• المخطط الجلوس

No, it is not a verb here. It is a verbal noun (called a maṣdar).

• Root verb: جلس = to sit
• Verbal noun: جلوس = sitting

In this sentence, الجلوس functions as a noun, not as an action word in a sentence.

So مخطط الجلوس is literally something like:

• plan of seating
• seating plan

This is similar to how English uses -ing words as nouns.

All of these are possible, but they are slightly different structures.

In your sentence:

• قرب الباب = near the door

Here قرب works as a noun/adverbial expression of place meaning near / in the vicinity of.

Other common alternatives are:

• قريب من الباب = close to the door
• بالقرب من الباب = near the door

So the given sentence uses a shorter, more compact structure.

Because قرب in this pattern can connect directly to the following noun.

So:

• قرب الباب = near the door

Grammatically, قرب is followed by a noun in a construction similar to iḍāfa:

• قربَ = near
• البابِ = the door

But if you use a different expression, such as قريب or بالقرب, then من is usually needed:

• قريب من الباب
• بالقرب من الباب

So the presence or absence of من depends on the exact word and structure being used.

A fully vowelled version as a sentence would be:

مُخَطَّطُ الجُلوسِ قُرْبَ البابِ

Case roles:

• مُخَطَّطُ — nominative, because it is the subject/topic
• الجُلوسِ — genitive, because it is the second term of the iḍāfa
• قُرْبَ — accusative, because it functions as an adverbial expression of place (ẓarf)
• البابِ — genitive, because it is attached to قرب

In normal pause, many speakers would not pronounce all those final short vowels clearly.

It is pronounced approximately:

mukhaṭṭaṭ

A few pronunciation notes:

• خ = a throaty kh sound
• ط = an emphatic t
• طّ (with shadda) means the ط is doubled/held a bit longer

So the word is not a simple mukhatat. The doubled طّ is important.

Here, it is functioning as a noun: plan / chart / layout.

Historically, forms like this can also behave like adjectives or participles in other contexts, but in this sentence it is best understood as a noun.

So:

• مخطط الجلوس = the seating chart / seating plan

not:

• planned seating in an adjective sense

Context tells you which role it is playing, and here the noun meaning is the natural one.